diff --git a/apidoc/src/search.md b/apidoc/src/search.md
index dc28ffe..0c9cb3f 100644
--- a/apidoc/src/search.md
+++ b/apidoc/src/search.md
@@ -1,14 +1,15 @@
 # Search Channels
 
-To search for e.g. DBPM channels in `sf-databuffer` that end in `:Q1` the request
-looks like this:
+Example search request:
 
 ```bash
-curl "https://data-api.psi.ch/api/4/search/channel?backend=sf-archiver&nameRegex=S10CB08-KBOC-HP.*PI-OUT"
+curl "https://data-api.psi.ch/api/4/search/channel?nameRegex=S10CB08-KBOC-HP.*PI-OUT"
 ```
 
 Parameters:
-- `icase=true` uses case-insensitive search (default: case-sensitive).
+- `nameRegex` searches for a channel name by regular expression.
+- `backend` restricts search to the given backend (optional).
+- `icase=true` uses case-insensitive search (optional, default case-sensitive).
 
 
 Example response:
diff --git a/crates/daqbuffer/Cargo.toml b/crates/daqbuffer/Cargo.toml
index 87b4d1b..8ffe5a8 100644
--- a/crates/daqbuffer/Cargo.toml
+++ b/crates/daqbuffer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "daqbuffer"
-version = "0.5.3-aa.4"
+version = "0.5.3-aa.5"
 authors = ["Dominik Werder <dominik.werder@gmail.com>"]
 edition = "2021"
 
diff --git a/crates/disk/src/dataopen.rs b/crates/disk/src/dataopen.rs
index fd661a1..4dc3e3c 100644
--- a/crates/disk/src/dataopen.rs
+++ b/crates/disk/src/dataopen.rs
@@ -51,10 +51,13 @@ async fn position_file(
             match OpenOptions::new().read(true).open(&index_path).await {
                 Ok(mut index_file) => {
                     let meta = index_file.metadata().await?;
-                    if meta.len() > 1024 * 1024 * 120 {
+                    if meta.len() > 1024 * 1024 * 500 {
                         let msg = format!("too large index file  {} bytes  for {:?}", meta.len(), index_path);
                         error!("{}", msg);
                         return Err(Error::with_msg(msg));
+                    } else if meta.len() > 1024 * 1024 * 200 {
+                        let msg = format!("very large index file  {} bytes  for {:?}", meta.len(), index_path);
+                        warn!("{}", msg);
                     } else if meta.len() > 1024 * 1024 * 80 {
                         let msg = format!("very large index file  {} bytes  for {:?}", meta.len(), index_path);
                         warn!("{}", msg);
@@ -184,12 +187,25 @@ async fn position_file(
 }
 
 pub struct OpenedFile {
+    pub pos: u64,
     pub path: PathBuf,
     pub file: Option<File>,
     pub positioned: bool,
     pub index: bool,
     pub nreads: u32,
-    pub pos: u64,
+}
+
+impl fmt::Debug for OpenedFile {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("OpenedFile")
+            .field("pos", &self.pos)
+            .field("path", &self.path)
+            .field("file", &self.file.is_some())
+            .field("positioned", &self.positioned)
+            .field("index", &self.index)
+            .field("nreads", &self.nreads)
+            .finish()
+    }
 }
 
 #[derive(Debug)]
@@ -198,18 +214,6 @@ pub struct OpenedFileSet {
     pub files: Vec<OpenedFile>,
 }
 
-impl fmt::Debug for OpenedFile {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_struct("OpenedFile")
-            .field("path", &self.path)
-            .field("file", &self.file)
-            .field("positioned", &self.positioned)
-            .field("index", &self.index)
-            .field("nreads", &self.nreads)
-            .finish()
-    }
-}
-
 pub fn open_files(
     range: &NanoRange,
     fetch_info: &SfChFetchInfo,
@@ -299,7 +303,7 @@ pub fn open_expanded_files(
                 Ok(_) => {}
                 Err(e) => {
                     // To be expected
-                    debug!("open_files  channel send error {:?}", e);
+                    debug!("open_expanded_files  channel send error {:?}", e);
                 }
             },
         }
@@ -345,18 +349,19 @@ async fn open_expanded_files_inner(
 ) -> Result<(), Error> {
     let fetch_info = fetch_info.clone();
     let timebins = get_timebins(&fetch_info, node.clone()).await?;
+    debug!("timebins {timebins:?}");
     if timebins.len() == 0 {
         return Ok(());
     }
     let mut p1 = None;
-    for (i1, tb) in timebins.iter().enumerate().rev() {
+    for (i, tb) in timebins.iter().enumerate().rev() {
         let ts_bin = TsNano::from_ns(tb * fetch_info.bs().ns());
         if ts_bin.ns() <= range.beg {
-            p1 = Some(i1);
+            p1 = Some(i);
             break;
         }
     }
-    let mut p1 = if let Some(i1) = p1 { i1 } else { 0 };
+    let mut p1 = if let Some(i) = p1 { i } else { 0 };
     if p1 >= timebins.len() {
         return Err(Error::with_msg(format!(
             "logic error p1 {}  range {:?}  fetch_info {:?}",
@@ -370,9 +375,11 @@ async fn open_expanded_files_inner(
         for path in paths::datapaths_for_timebin(tb, &fetch_info, &node).await? {
             let w = position_file(&path, range, true, false).await?;
             if w.found {
-                debug!("----- open_expanded_files_inner  w.found for {:?}", path);
+                debug!("----- open_expanded_files_inner  FOUND  tb {:?}  path {:?}", tb, path);
                 a.push(w.file);
                 found_pre = true;
+            } else {
+                debug!("----- open_expanded_files_inner  UNFND  tb {:?}  path {:?}", tb, path);
             }
         }
         let h = OpenedFileSet { timebin: tb, files: a };
diff --git a/crates/disk/src/eventchunker.rs b/crates/disk/src/eventchunker.rs
index 6f3edcf..288e29f 100644
--- a/crates/disk/src/eventchunker.rs
+++ b/crates/disk/src/eventchunker.rs
@@ -73,7 +73,6 @@ pub struct EventChunker {
     node_ix: usize,
     dbg_path: PathBuf,
     last_ts: u64,
-    expand: bool,
     item_len_emit_histo: HistoLog2,
     seen_before_range_count: usize,
     seen_after_range_count: usize,
@@ -144,7 +143,6 @@ impl EventChunker {
         stats_conf: EventChunkerConf,
         node_ix: usize,
         dbg_path: PathBuf,
-        expand: bool,
     ) -> Self {
         debug!("{}::{}  node {}", Self::self_name(), "from_start", node_ix);
         let need_min_max = match fetch_info.shape() {
@@ -172,7 +170,6 @@ impl EventChunker {
             dbg_path,
             node_ix,
             last_ts: 0,
-            expand,
             item_len_emit_histo: HistoLog2::new(0),
             seen_before_range_count: 0,
             seen_after_range_count: 0,
@@ -188,7 +185,6 @@ impl EventChunker {
         }
     }
 
-    // TODO   `expand` flag usage
     pub fn from_event_boundary(
         inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, Error>> + Send>>,
         fetch_info: SfChFetchInfo,
@@ -196,10 +192,9 @@ impl EventChunker {
         stats_conf: EventChunkerConf,
         node_ix: usize,
         dbg_path: PathBuf,
-        expand: bool,
     ) -> Self {
         debug!("{}::{}  node {}", Self::self_name(), "from_event_boundary", node_ix);
-        let mut ret = Self::from_start(inp, fetch_info, range, stats_conf, node_ix, dbg_path, expand);
+        let mut ret = Self::from_start(inp, fetch_info, range, stats_conf, node_ix, dbg_path);
         ret.state = DataFileState::Event;
         ret.need_min = 4;
         ret.inp.set_need_min(4);
@@ -324,15 +319,15 @@ impl EventChunker {
                             discard = true;
                             self.discard_count_range += 1;
                             self.seen_after_range_count += 1;
-                            if !self.expand || self.seen_after_range_count >= 2 {
-                                self.seen_beyond_range = true;
+                            self.seen_beyond_range = true;
+                            if self.seen_after_range_count >= 2 {
                                 self.data_emit_complete = true;
                                 break;
                             }
                         }
                         if ts < self.range.beg {
-                            discard = true;
-                            self.discard_count_range += 1;
+                            // discard = true;
+                            // self.discard_count_range += 1;
                             self.seen_before_range_count += 1;
                             if self.seen_before_range_count < 20 {
                                 let msg = format!(
@@ -349,6 +344,8 @@ impl EventChunker {
                                     self.dbg_path
                                 );
                                 warn!("{}", msg);
+                                let item = LogItem::from_node(self.node_ix, Level::INFO, msg);
+                                self.log_items.push_back(item);
                             }
                             if self.seen_before_range_count > 100 {
                                 let msg = format!(
@@ -474,13 +471,17 @@ impl EventChunker {
                                 shape_this,
                                 comp_this,
                             );
-                            match ret.shape_derived(ret.len() - 1, self.fetch_info.shape()) {
+                            match ret.shape_derived(
+                                ret.len() - 1,
+                                self.fetch_info.scalar_type(),
+                                self.fetch_info.shape(),
+                            ) {
                                 Ok(sh) => {
                                     if sh.ne(self.fetch_info.shape()) {
                                         self.discard_count_shape_derived += 1;
                                         ret.pop_back();
                                         let msg = format!(
-                                            "shape_derived mismatch  {:?}  {:?}  {:?}",
+                                            "EventChunker  shape_derived mismatch  {:?}  {:?}  {:?}",
                                             self.fetch_info.scalar_type(),
                                             self.fetch_info.shape(),
                                             sh,
@@ -493,7 +494,7 @@ impl EventChunker {
                                     self.discard_count_shape_derived_err += 1;
                                     ret.pop_back();
                                     let msg = format!(
-                                        "shape_derived error  {}  {:?}  {:?}",
+                                        "EventChunker  shape_derived error  {}  {:?}  {:?}",
                                         e,
                                         self.fetch_info.scalar_type(),
                                         self.fetch_info.shape(),
diff --git a/crates/disk/src/eventchunkermultifile.rs b/crates/disk/src/eventchunkermultifile.rs
index 934a2a0..764c5e3 100644
--- a/crates/disk/src/eventchunkermultifile.rs
+++ b/crates/disk/src/eventchunkermultifile.rs
@@ -39,7 +39,7 @@ pub struct EventChunkerMultifile {
     range: NanoRange,
     files_count: u32,
     node_ix: usize,
-    expand: bool,
+    one_before: bool,
     max_ts: u64,
     out_max_len: usize,
     emit_count: usize,
@@ -64,12 +64,12 @@ impl EventChunkerMultifile {
         node_ix: usize,
         disk_io_tune: DiskIoTune,
         event_chunker_conf: EventChunkerConf,
-        expand: bool,
+        one_before: bool,
         out_max_len: usize,
         reqctx: ReqCtxArc,
     ) -> Self {
-        debug!("EventChunkerMultifile  expand {expand}");
-        let file_chan = if expand {
+        debug!("EventChunkerMultifile  one_before {one_before}");
+        let file_chan = if one_before {
             open_expanded_files(&range, &fetch_info, node)
         } else {
             open_files(&range, &fetch_info, reqctx.reqid(), node)
@@ -83,7 +83,7 @@ impl EventChunkerMultifile {
             range,
             files_count: 0,
             node_ix,
-            expand,
+            one_before,
             max_ts: 0,
             out_max_len,
             emit_count: 0,
@@ -129,6 +129,9 @@ impl Stream for EventChunkerMultifile {
                                 if h.len() > 0 {
                                     let min = h.tss.iter().fold(u64::MAX, |a, &x| a.min(x));
                                     let max = h.tss.iter().fold(u64::MIN, |a, &x| a.max(x));
+                                    if min < self.range.beg() {
+                                        debug!("ITEM BEFORE RANGE (how many?)");
+                                    }
                                     if min <= self.max_ts {
                                         let msg = format!("EventChunkerMultifile  repeated or unordered ts {}", min);
                                         error!("{}", msg);
@@ -180,13 +183,19 @@ impl Stream for EventChunkerMultifile {
                     None => match self.file_chan.poll_next_unpin(cx) {
                         Ready(Some(k)) => match k {
                             Ok(ofs) => {
+                                let msg = format!("received files for timebin {:?}", ofs.timebin);
+                                let item = LogItem::from_node(self.node_ix, Level::INFO, msg);
+                                self.log_queue.push_back(item);
+                                for e in &ofs.files {
+                                    let msg = format!("file {:?}", e);
+                                    let item = LogItem::from_node(self.node_ix, Level::INFO, msg);
+                                    self.log_queue.push_back(item);
+                                }
                                 self.files_count += ofs.files.len() as u32;
                                 if ofs.files.len() == 1 {
                                     let mut ofs = ofs;
                                     let file = ofs.files.pop().unwrap();
                                     let path = file.path;
-                                    let msg = format!("use opened files {:?}", ofs);
-                                    let item = LogItem::from_node(self.node_ix, Level::DEBUG, msg);
                                     match file.file {
                                         Some(file) => {
                                             let inp = Box::pin(crate::file_content_stream(
@@ -202,22 +211,19 @@ impl Stream for EventChunkerMultifile {
                                                 self.event_chunker_conf.clone(),
                                                 self.node_ix,
                                                 path.clone(),
-                                                self.expand,
                                             );
-                                            let filtered = RangeFilter2::new(chunker, self.range.clone(), self.expand);
+                                            let filtered =
+                                                RangeFilter2::new(chunker, self.range.clone(), self.one_before);
                                             self.evs = Some(Box::pin(filtered));
                                         }
                                         None => {}
                                     }
-                                    Ready(Some(Ok(StreamItem::Log(item))))
+                                    continue;
                                 } else if ofs.files.len() == 0 {
                                     let msg = format!("use opened files {:?}  no files", ofs);
                                     let item = LogItem::from_node(self.node_ix, Level::DEBUG, msg);
                                     Ready(Some(Ok(StreamItem::Log(item))))
                                 } else {
-                                    // let paths: Vec<_> = ofs.files.iter().map(|x| &x.path).collect();
-                                    let msg = format!("use opened files {:?}  locally merged", ofs);
-                                    let item = LogItem::from_node(self.node_ix, Level::DEBUG, msg);
                                     let mut chunkers = Vec::new();
                                     for of in ofs.files {
                                         if let Some(file) = of.file {
@@ -234,14 +240,15 @@ impl Stream for EventChunkerMultifile {
                                                 self.event_chunker_conf.clone(),
                                                 self.node_ix,
                                                 of.path.clone(),
-                                                self.expand,
                                             );
                                             chunkers.push(Box::pin(chunker) as _);
                                         }
                                     }
                                     let merged = Merger::new(chunkers, Some(self.out_max_len as u32));
-                                    let filtered = RangeFilter2::new(merged, self.range.clone(), self.expand);
+                                    let filtered = RangeFilter2::new(merged, self.range.clone(), self.one_before);
                                     self.evs = Some(Box::pin(filtered));
+                                    let msg = format!("LOCALLY MERGED");
+                                    let item = LogItem::from_node(self.node_ix, Level::DEBUG, msg);
                                     Ready(Some(Ok(StreamItem::Log(item))))
                                 }
                             }
diff --git a/crates/disk/src/eventfilter.rs b/crates/disk/src/eventfilter.rs
index 7d7b7a3..f043525 100644
--- a/crates/disk/src/eventfilter.rs
+++ b/crates/disk/src/eventfilter.rs
@@ -6,6 +6,7 @@ use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
 use items_0::WithLen;
 use items_2::eventfull::EventFull;
+use netpod::ScalarType;
 use netpod::Shape;
 use std::collections::VecDeque;
 use std::pin::Pin;
@@ -15,6 +16,7 @@ use tracing::Level;
 
 pub struct EventFullShapeFilter<INP> {
     inp: INP,
+    scalar_type_exp: ScalarType,
     shape_exp: Shape,
     node_ix: usize,
     log_items: VecDeque<LogItem>,
@@ -25,11 +27,14 @@ impl<INP> EventFullShapeFilter<INP> {
         let node_ix = self.node_ix;
         let p: Vec<_> = (0..item.len())
             .map(|i| {
-                let sh = item.shape_derived(i, &self.shape_exp);
+                let sh = item.shape_derived(i, &self.scalar_type_exp, &self.shape_exp);
                 match sh {
                     Ok(sh) => {
                         if sh.ne(&self.shape_exp) {
-                            let msg = format!("shape_derived mismatch  {:?}  {:?}", sh, self.shape_exp);
+                            let msg = format!(
+                                "EventFullShapeFilter  shape_derived mismatch  {:?}  {:?}",
+                                sh, self.shape_exp
+                            );
                             let item = LogItem::from_node(node_ix, Level::WARN, msg);
                             self.log_items.push_back(item);
                             false
@@ -38,7 +43,10 @@ impl<INP> EventFullShapeFilter<INP> {
                         }
                     }
                     Err(_) => {
-                        let msg = format!("shape_derived mismatch  {:?}  {:?}", sh, self.shape_exp);
+                        let msg = format!(
+                            "EventFullShapeFilter  shape_derived mismatch  {:?}  {:?}",
+                            sh, self.shape_exp
+                        );
                         let item = LogItem::from_node(self.node_ix, Level::WARN, msg);
                         self.log_items.push_back(item);
                         false
diff --git a/crates/disk/src/raw/conn.rs b/crates/disk/src/raw/conn.rs
index 5f3fee0..29832dd 100644
--- a/crates/disk/src/raw/conn.rs
+++ b/crates/disk/src/raw/conn.rs
@@ -62,11 +62,8 @@ pub async fn make_event_pipe(
 ) -> Result<Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>>, Error> {
     // sf-databuffer type backends identify channels by their (backend, name) only.
     let range = evq.range().clone();
-    let one_before = evq.transform().need_one_before_range();
-    info!(
-        "make_event_pipe  need_expand {need_expand}  {evq:?}",
-        need_expand = one_before
-    );
+    let one_before = evq.need_one_before_range();
+    info!("make_event_pipe  one_before {one_before}  {evq:?}");
     let event_chunker_conf = EventChunkerConf::new(ByteSize::from_kb(1024));
     // TODO should not need this for correctness.
     // Should limit based on return size and latency.
@@ -94,7 +91,7 @@ pub async fn make_event_pipe(
 pub fn make_event_blobs_stream(
     range: NanoRange,
     fetch_info: SfChFetchInfo,
-    expand: bool,
+    one_before: bool,
     event_chunker_conf: EventChunkerConf,
     disk_io_tune: DiskIoTune,
     reqctx: ReqCtxArc,
@@ -115,7 +112,7 @@ pub fn make_event_blobs_stream(
         ncc.ix,
         disk_io_tune,
         event_chunker_conf,
-        expand,
+        one_before,
         out_max_len,
         reqctx,
     );
@@ -128,13 +125,13 @@ pub fn make_event_blobs_pipe_real(
     reqctx: ReqCtxArc,
     ncc: &NodeConfigCached,
 ) -> Result<Pin<Box<dyn Stream<Item = Sitemty<EventFull>> + Send>>, Error> {
-    let expand = subq.transform().need_one_before_range();
+    let one_before = subq.need_one_before_range();
     let range = subq.range();
     let event_chunker_conf = EventChunkerConf::new(ByteSize::from_kb(1024));
     let event_blobs = make_event_blobs_stream(
         range.try_into()?,
         fetch_info.clone(),
-        expand,
+        one_before,
         event_chunker_conf,
         subq.disk_io_tune(),
         reqctx,
diff --git a/crates/dq/src/bin/dq.rs b/crates/dq/src/bin/dq.rs
index 80bdcfa..a6bf664 100644
--- a/crates/dq/src/bin/dq.rs
+++ b/crates/dq/src/bin/dq.rs
@@ -94,7 +94,7 @@ pub fn main() -> Result<(), Error> {
                 let stats_conf = EventChunkerConf {
                     disk_stats_every: ByteSize::from_mb(2),
                 };
-                let _chunks = EventChunker::from_start(inp, fetch_info, range, stats_conf, 0, path.clone(), true);
+                let _chunks = EventChunker::from_start(inp, fetch_info, range, stats_conf, 0, path.clone());
                 err::todo();
                 Ok(())
             }
diff --git a/crates/items_0/src/items_0.rs b/crates/items_0/src/items_0.rs
index aeff1c4..9161d06 100644
--- a/crates/items_0/src/items_0.rs
+++ b/crates/items_0/src/items_0.rs
@@ -9,6 +9,7 @@ pub mod subfr;
 pub mod test;
 pub mod timebin;
 pub mod transform;
+pub mod vecpreview;
 
 pub mod bincode {
     pub use bincode::*;
@@ -21,6 +22,7 @@ use container::ByteEstimate;
 use std::any::Any;
 use std::collections::VecDeque;
 use std::fmt;
+use timebin::BinningggContainerEventsDyn;
 use timebin::TimeBinnable;
 
 pub trait WithLen {
@@ -158,6 +160,7 @@ pub trait Events:
     fn clear(&mut self);
     // TODO: can not name EventsDim0 from here, so use trait object for now. Anyway is a workaround.
     fn to_dim0_f32_for_binning(&self) -> Box<dyn Events>;
+    fn to_container_events(&self) -> Box<dyn BinningggContainerEventsDyn>;
 }
 
 impl WithLen for Box<dyn Events> {
@@ -296,4 +299,8 @@ impl Events for Box<dyn Events> {
     fn to_dim0_f32_for_binning(&self) -> Box<dyn Events> {
         Events::to_dim0_f32_for_binning(self.as_ref())
     }
+
+    fn to_container_events(&self) -> Box<dyn BinningggContainerEventsDyn> {
+        Events::to_container_events(self.as_ref())
+    }
 }
diff --git a/crates/items_0/src/timebin.rs b/crates/items_0/src/timebin.rs
index 0d15004..52ce431 100644
--- a/crates/items_0/src/timebin.rs
+++ b/crates/items_0/src/timebin.rs
@@ -4,18 +4,24 @@ use crate::collect_s::Collectable;
 use crate::collect_s::Collector;
 use crate::collect_s::ToJsonResult;
 use crate::overlap::RangeOverlapInfo;
+use crate::vecpreview::PreviewRange;
 use crate::AsAnyMut;
 use crate::AsAnyRef;
+use crate::Empty;
 use crate::Events;
 use crate::Resettable;
 use crate::TypeName;
 use crate::WithLen;
+use err::thiserror;
 use err::Error;
+use err::ThisError;
 use netpod::log::*;
 use netpod::range::evrange::SeriesRange;
 use netpod::BinnedRange;
 use netpod::BinnedRangeEnum;
 use netpod::TsNano;
+use serde::Deserialize;
+use serde::Serialize;
 use std::any::Any;
 use std::fmt;
 use std::ops::Range;
@@ -64,10 +70,20 @@ pub trait TimeBinnableTy: fmt::Debug + WithLen + Send + Sized {
     ) -> Self::TimeBinner;
 }
 
+// #[derive(Debug, ThisError)]
+// #[cstm(name = "Binninggg")]
 pub enum BinningggError {
     Dyn(Box<dyn std::error::Error>),
 }
 
+impl fmt::Display for BinningggError {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            BinningggError::Dyn(e) => write!(fmt, "{e}"),
+        }
+    }
+}
+
 impl<E> From<E> for BinningggError
 where
     E: std::error::Error + 'static,
@@ -77,11 +93,21 @@ where
     }
 }
 
-pub trait BinningggContainerEventsDyn: fmt::Debug {
+pub trait BinningggContainerEventsDyn: fmt::Debug + Send {
     fn binned_events_timeweight_traitobj(&self) -> Box<dyn BinnedEventsTimeweightTrait>;
 }
 
-pub trait BinningggContainerBinsDyn: fmt::Debug {}
+pub trait BinningggContainerBinsDyn: fmt::Debug + Send + fmt::Display + WithLen {
+    fn empty(&self) -> BinsBoxed;
+    fn clone(&self) -> BinsBoxed;
+    fn edges_iter(
+        &self,
+    ) -> std::iter::Zip<std::collections::vec_deque::Iter<TsNano>, std::collections::vec_deque::Iter<TsNano>>;
+    fn drain_into(&mut self, dst: &mut dyn BinningggContainerBinsDyn, range: Range<usize>);
+    fn to_old_time_binned(&self) -> Box<dyn TimeBinned>;
+}
+
+pub type BinsBoxed = Box<dyn BinningggContainerBinsDyn>;
 
 pub trait BinningggBinnerTy: fmt::Debug + Send {
     type Input: fmt::Debug;
diff --git a/crates/items_0/src/vecpreview.rs b/crates/items_0/src/vecpreview.rs
new file mode 100644
index 0000000..74f23ec
--- /dev/null
+++ b/crates/items_0/src/vecpreview.rs
@@ -0,0 +1,53 @@
+use core::fmt;
+use std::collections::VecDeque;
+
+pub struct PreviewCell<'a, T> {
+    pub a: Option<&'a T>,
+    pub b: Option<&'a T>,
+}
+
+impl<'a, T> fmt::Debug for PreviewCell<'a, T>
+where
+    T: fmt::Debug,
+{
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match (self.a.as_ref(), self.b.as_ref()) {
+            (Some(a), Some(b)) => write!(fmt, "{:?} .. {:?}", a, b),
+            (Some(a), None) => write!(fmt, "{:?}", a),
+            _ => write!(fmt, "(empty)"),
+        }
+    }
+}
+
+pub trait PreviewRange {
+    fn preview<'a>(&'a self) -> Box<dyn fmt::Debug + 'a>;
+}
+
+impl<T> PreviewRange for VecDeque<T>
+where
+    T: fmt::Debug,
+{
+    fn preview<'a>(&'a self) -> Box<dyn fmt::Debug + 'a> {
+        let ret = PreviewCell {
+            a: self.front(),
+            b: if self.len() <= 1 { None } else { self.back() },
+        };
+        Box::new(ret)
+    }
+}
+
+pub struct VecPreview<'a> {
+    c: &'a dyn PreviewRange,
+}
+
+impl<'a> VecPreview<'a> {
+    pub fn new(c: &'a dyn PreviewRange) -> Self {
+        Self { c }
+    }
+}
+
+impl<'a> fmt::Debug for VecPreview<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        write!(fmt, "{:?}", self.c.preview())
+    }
+}
diff --git a/crates/items_2/src/binning/container_bins.rs b/crates/items_2/src/binning/container_bins.rs
index 5bc1e12..f1b2e0b 100644
--- a/crates/items_2/src/binning/container_bins.rs
+++ b/crates/items_2/src/binning/container_bins.rs
@@ -2,11 +2,10 @@ use super::aggregator::AggregatorNumeric;
 use super::aggregator::AggregatorTimeWeight;
 use super::container_events::EventValueType;
 use super::___;
-use crate::vecpreview::PreviewRange;
-use crate::vecpreview::VecPreview;
 use core::fmt;
 use err::thiserror;
 use err::ThisError;
+use items_0::vecpreview::VecPreview;
 use netpod::TsNano;
 use serde::Deserialize;
 use serde::Serialize;
@@ -114,6 +113,28 @@ impl<EVT> ContainerBins<EVT>
 where
     EVT: EventValueType,
 {
+    pub fn from_constituents(
+        ts1s: VecDeque<TsNano>,
+        ts2s: VecDeque<TsNano>,
+        cnts: VecDeque<u64>,
+        mins: VecDeque<EVT>,
+        maxs: VecDeque<EVT>,
+        avgs: VecDeque<EVT::AggTimeWeightOutputAvg>,
+        lsts: VecDeque<EVT>,
+        fnls: VecDeque<bool>,
+    ) -> Self {
+        Self {
+            ts1s,
+            ts2s,
+            cnts,
+            mins,
+            maxs,
+            avgs,
+            lsts,
+            fnls,
+        }
+    }
+
     pub fn type_name() -> &'static str {
         any::type_name::<Self>()
     }
@@ -153,6 +174,14 @@ where
         self.ts2s.back().map(|&x| x)
     }
 
+    pub fn ts1s_iter(&self) -> std::collections::vec_deque::Iter<TsNano> {
+        self.ts1s.iter()
+    }
+
+    pub fn ts2s_iter(&self) -> std::collections::vec_deque::Iter<TsNano> {
+        self.ts2s.iter()
+    }
+
     pub fn cnts_iter(&self) -> std::collections::vec_deque::Iter<u64> {
         self.cnts.iter()
     }
@@ -165,6 +194,50 @@ where
         self.maxs.iter()
     }
 
+    pub fn avgs_iter(&self) -> std::collections::vec_deque::Iter<EVT::AggTimeWeightOutputAvg> {
+        self.avgs.iter()
+    }
+
+    pub fn fnls_iter(&self) -> std::collections::vec_deque::Iter<bool> {
+        self.fnls.iter()
+    }
+
+    pub fn zip_iter(
+        &self,
+    ) -> std::iter::Zip<
+        std::iter::Zip<
+            std::iter::Zip<
+                std::iter::Zip<
+                    std::iter::Zip<
+                        std::iter::Zip<
+                            std::collections::vec_deque::Iter<TsNano>,
+                            std::collections::vec_deque::Iter<TsNano>,
+                        >,
+                        std::collections::vec_deque::Iter<u64>,
+                    >,
+                    std::collections::vec_deque::Iter<EVT>,
+                >,
+                std::collections::vec_deque::Iter<EVT>,
+            >,
+            std::collections::vec_deque::Iter<EVT::AggTimeWeightOutputAvg>,
+        >,
+        std::collections::vec_deque::Iter<bool>,
+    > {
+        self.ts1s_iter()
+            .zip(self.ts2s_iter())
+            .zip(self.cnts_iter())
+            .zip(self.mins_iter())
+            .zip(self.maxs_iter())
+            .zip(self.avgs_iter())
+            .zip(self.fnls_iter())
+    }
+
+    pub fn edges_iter(
+        &self,
+    ) -> std::iter::Zip<std::collections::vec_deque::Iter<TsNano>, std::collections::vec_deque::Iter<TsNano>> {
+        self.ts1s.iter().zip(self.ts2s.iter())
+    }
+
     pub fn len_before(&self, end: TsNano) -> usize {
         let pp = self.ts2s.partition_point(|&x| x <= end);
         assert!(pp <= self.len(), "len_before  pp {}  len {}", pp, self.len());
diff --git a/crates/items_2/src/binning/container_events.rs b/crates/items_2/src/binning/container_events.rs
index 3d8fc6c..9763359 100644
--- a/crates/items_2/src/binning/container_events.rs
+++ b/crates/items_2/src/binning/container_events.rs
@@ -2,11 +2,12 @@ use super::aggregator::AggTimeWeightOutputAvg;
 use super::aggregator::AggregatorNumeric;
 use super::aggregator::AggregatorTimeWeight;
 use super::___;
-use crate::vecpreview::PreviewRange;
-use crate::vecpreview::VecPreview;
 use core::fmt;
 use err::thiserror;
 use err::ThisError;
+use items_0::timebin::BinningggContainerEventsDyn;
+use items_0::vecpreview::PreviewRange;
+use items_0::vecpreview::VecPreview;
 use netpod::TsNano;
 use serde::Deserialize;
 use serde::Serialize;
@@ -20,7 +21,7 @@ macro_rules! trace_init { ($($arg:tt)*) => ( if true { trace!($($arg)*); }) }
 #[cstm(name = "ValueContainerError")]
 pub enum ValueContainerError {}
 
-pub trait Container<EVT>: fmt::Debug + Clone + PreviewRange + Serialize + for<'a> Deserialize<'a> {
+pub trait Container<EVT>: fmt::Debug + Send + Clone + PreviewRange + Serialize + for<'a> Deserialize<'a> {
     fn new() -> Self;
     // fn verify(&self) -> Result<(), ValueContainerError>;
     fn push_back(&mut self, val: EVT);
@@ -120,6 +121,10 @@ impl<EVT> ContainerEvents<EVT>
 where
     EVT: EventValueType,
 {
+    pub fn from_constituents(tss: VecDeque<TsNano>, vals: <EVT as EventValueType>::Container) -> Self {
+        Self { tss, vals }
+    }
+
     pub fn type_name() -> &'static str {
         any::type_name::<Self>()
     }
@@ -233,3 +238,12 @@ where
         }
     }
 }
+
+impl<EVT> BinningggContainerEventsDyn for ContainerEvents<EVT>
+where
+    EVT: EventValueType,
+{
+    fn binned_events_timeweight_traitobj(&self) -> Box<dyn items_0::timebin::BinnedEventsTimeweightTrait> {
+        todo!()
+    }
+}
diff --git a/crates/items_2/src/binning/timeweight.rs b/crates/items_2/src/binning/timeweight.rs
index b9791c9..8015202 100644
--- a/crates/items_2/src/binning/timeweight.rs
+++ b/crates/items_2/src/binning/timeweight.rs
@@ -1,4 +1,5 @@
 pub mod timeweight_bins;
+pub mod timeweight_bins_dyn;
 pub mod timeweight_events;
 pub mod timeweight_events_dyn;
 
diff --git a/crates/items_2/src/binning/timeweight/timeweight_bins_dyn.rs b/crates/items_2/src/binning/timeweight/timeweight_bins_dyn.rs
new file mode 100644
index 0000000..1b65daa
--- /dev/null
+++ b/crates/items_2/src/binning/timeweight/timeweight_bins_dyn.rs
@@ -0,0 +1,27 @@
+use futures_util::Stream;
+use items_0::streamitem::Sitemty;
+use items_0::timebin::BinningggContainerBinsDyn;
+use netpod::BinnedRange;
+use netpod::TsNano;
+use std::pin::Pin;
+use std::task::Context;
+use std::task::Poll;
+
+pub struct BinnedBinsTimeweightStream {}
+
+impl BinnedBinsTimeweightStream {
+    pub fn new(
+        range: BinnedRange<TsNano>,
+        inp: Pin<Box<dyn Stream<Item = Sitemty<Box<dyn BinningggContainerBinsDyn>>> + Send>>,
+    ) -> Self {
+        todo!()
+    }
+}
+
+impl Stream for BinnedBinsTimeweightStream {
+    type Item = Sitemty<Box<dyn BinningggContainerBinsDyn>>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        todo!()
+    }
+}
diff --git a/crates/items_2/src/binning/timeweight/timeweight_events.rs b/crates/items_2/src/binning/timeweight/timeweight_events.rs
index a5f8c75..b0601b6 100644
--- a/crates/items_2/src/binning/timeweight/timeweight_events.rs
+++ b/crates/items_2/src/binning/timeweight/timeweight_events.rs
@@ -19,6 +19,7 @@ use netpod::DtNano;
 use netpod::TsNano;
 use std::collections::VecDeque;
 use std::marker::PhantomData;
+use std::mem;
 use std::pin::Pin;
 use std::task::Context;
 use std::task::Poll;
@@ -382,6 +383,7 @@ where
     range: BinnedRange<TsNano>,
     inner_a: InnerA<EVT>,
     out: ContainerBins<EVT>,
+    produce_cnt_zero: bool,
 }
 
 impl<EVT> fmt::Debug for BinnedEventsTimeweight<EVT>
@@ -422,9 +424,16 @@ where
             },
             lst: None,
             out: ContainerBins::new(),
+            produce_cnt_zero: true,
         }
     }
 
+    pub fn disable_cnt_zero(self) -> Self {
+        let mut ret = self;
+        ret.produce_cnt_zero = false;
+        ret
+    }
+
     fn ingest_event_without_lst(&mut self, ev: EventSingle<EVT>) -> Result<(), Error> {
         let b = &self.inner_a.inner_b;
         if ev.ts >= b.active_end {
@@ -485,10 +494,26 @@ where
         let div = b.active_len.ns();
         if let Some(lst) = self.lst.as_ref() {
             let lst = LstRef(lst);
-            let mut i = 0;
-            loop {
-                i += 1;
-                assert!(i < 100000, "too many iterations");
+            if self.produce_cnt_zero {
+                let mut i = 0;
+                loop {
+                    i += 1;
+                    assert!(i < 100000, "too many iterations");
+                    let b = &self.inner_a.inner_b;
+                    if ts > b.filled_until {
+                        if ts >= b.active_end {
+                            if b.filled_until < b.active_end {
+                                self.inner_a.inner_b.fill_until(b.active_end, lst.clone());
+                            }
+                            self.inner_a.push_out_and_reset(lst.clone(), true, &mut self.out);
+                        } else {
+                            self.inner_a.inner_b.fill_until(ts, lst.clone());
+                        }
+                    } else {
+                        break;
+                    }
+                }
+            } else {
                 let b = &self.inner_a.inner_b;
                 if ts > b.filled_until {
                     if ts >= b.active_end {
@@ -497,13 +522,29 @@ where
                         }
                         self.inner_a.push_out_and_reset(lst.clone(), true, &mut self.out);
                     } else {
+                        // TODO should not hit this case. Prove it, assert it.
                         self.inner_a.inner_b.fill_until(ts, lst.clone());
                     }
                 } else {
-                    break;
+                    // TODO should never hit this case. Count.
                 }
+
+                // TODO jump to next bin
+                // TODO merge with the other reset
+                // Below uses the same code
+                let ts1 = TsNano::from_ns(ts.ns() / div * div);
+                let b = &mut self.inner_a.inner_b;
+                b.active_beg = ts1;
+                b.active_end = ts1.add_dt_nano(b.active_len);
+                b.filled_until = ts1;
+                b.filled_width = DtNano::from_ns(0);
+                b.cnt = 0;
+                b.agg.reset_for_new_bin();
+                // assert!(self.inner_a.minmax.is_none());
+                trace_cycle!("cycled direct to  {:?}  {:?}", b.active_beg, b.active_end);
             }
         } else {
+            assert!(self.inner_a.minmax.is_none());
             // TODO merge with the other reset
             let ts1 = TsNano::from_ns(ts.ns() / div * div);
             let b = &mut self.inner_a.inner_b;
@@ -513,7 +554,6 @@ where
             b.filled_width = DtNano::from_ns(0);
             b.cnt = 0;
             b.agg.reset_for_new_bin();
-            assert!(self.inner_a.minmax.is_none());
             trace_cycle!("cycled direct to  {:?}  {:?}", b.active_beg, b.active_end);
         }
     }
@@ -594,6 +634,6 @@ where
     }
 
     pub fn output(&mut self) -> ContainerBins<EVT> {
-        ::core::mem::replace(&mut self.out, ContainerBins::new())
+        mem::replace(&mut self.out, ContainerBins::new())
     }
 }
diff --git a/crates/items_2/src/binning/timeweight/timeweight_events_dyn.rs b/crates/items_2/src/binning/timeweight/timeweight_events_dyn.rs
index 3d30552..d94f8c3 100644
--- a/crates/items_2/src/binning/timeweight/timeweight_events_dyn.rs
+++ b/crates/items_2/src/binning/timeweight/timeweight_events_dyn.rs
@@ -1,9 +1,11 @@
 use super::timeweight_events::BinnedEventsTimeweight;
+use crate::binning::container_bins::ContainerBins;
 use crate::binning::container_events::EventValueType;
 use crate::channelevents::ChannelEvents;
 use err::thiserror;
 use err::ThisError;
 use futures_util::Stream;
+use futures_util::StreamExt;
 use items_0::streamitem::Sitemty;
 use items_0::timebin::BinnedEventsTimeweightTrait;
 use items_0::timebin::BinningggBinnerDyn;
@@ -12,6 +14,8 @@ use items_0::timebin::BinningggContainerEventsDyn;
 use items_0::timebin::BinningggError;
 use netpod::BinnedRange;
 use netpod::TsNano;
+use std::arch::x86_64;
+use std::ops::ControlFlow;
 use std::pin::Pin;
 use std::task::Context;
 use std::task::Poll;
@@ -68,18 +72,6 @@ where
     }
 }
 
-pub struct BinnedEventsTimeweightStream {
-    inp: Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>>,
-}
-
-impl Stream for BinnedEventsTimeweightStream {
-    type Item = ();
-
-    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
-        todo!()
-    }
-}
-
 #[derive(Debug)]
 pub struct BinnedEventsTimeweightLazy {
     range: BinnedRange<TsNano>,
@@ -114,3 +106,109 @@ impl BinnedEventsTimeweightTrait for BinnedEventsTimeweightLazy {
         todo!()
     }
 }
+
+enum StreamState {
+    Reading,
+    Done,
+}
+
+pub struct BinnedEventsTimeweightStream {
+    state: StreamState,
+    inp: Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>>,
+    binned_events: BinnedEventsTimeweightLazy,
+    range_complete: bool,
+}
+
+impl BinnedEventsTimeweightStream {
+    pub fn new(range: BinnedRange<TsNano>, inp: Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>>) -> Self {
+        Self {
+            state: StreamState::Reading,
+            inp,
+            binned_events: BinnedEventsTimeweightLazy::new(range),
+            range_complete: false,
+        }
+    }
+
+    fn handle_sitemty(
+        mut self: Pin<&mut Self>,
+        item: Sitemty<ChannelEvents>,
+        cx: &mut Context,
+    ) -> ControlFlow<Poll<Option<<Self as Stream>::Item>>> {
+        use items_0::streamitem::RangeCompletableItem::*;
+        use items_0::streamitem::StreamItem::*;
+        use ControlFlow::*;
+        use Poll::*;
+        match item {
+            Ok(x) => match x {
+                DataItem(x) => match x {
+                    Data(x) => match x {
+                        ChannelEvents::Events(evs) => match self.binned_events.ingest(evs.to_container_events()) {
+                            Ok(()) => {
+                                match self.binned_events.output() {
+                                    Ok(x) => {
+                                        if x.len() == 0 {
+                                            Continue(())
+                                        } else {
+                                            Break(Ready(Some(Ok(DataItem(Data(x))))))
+                                        }
+                                    }
+                                    Err(e) => Break(Ready(Some(Err(::err::Error::from_string(e))))),
+                                }
+                                // Continue(())
+                            }
+                            Err(e) => Break(Ready(Some(Err(::err::Error::from_string(e))))),
+                        },
+                        ChannelEvents::Status(_) => {
+                            // TODO use the status
+                            Continue(())
+                        }
+                    },
+                    RangeComplete => {
+                        self.range_complete = true;
+                        Continue(())
+                    }
+                },
+                Log(x) => Break(Ready(Some(Ok(Log(x))))),
+                Stats(x) => Break(Ready(Some(Ok(Stats(x))))),
+            },
+            Err(e) => {
+                self.state = StreamState::Done;
+                Break(Ready(Some(Err(e))))
+            }
+        }
+    }
+
+    fn handle_eos(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<<Self as Stream>::Item>> {
+        use items_0::streamitem::RangeCompletableItem::*;
+        use items_0::streamitem::StreamItem::*;
+        use Poll::*;
+        if self.range_complete {
+            self.binned_events.input_done_range_final();
+        } else {
+            self.binned_events.input_done_range_open();
+        }
+        match self.binned_events.output() {
+            Ok(x) => Ready(Some(Ok(DataItem(Data(x))))),
+            Err(e) => Ready(Some(Err(::err::Error::from_string(e)))),
+        }
+    }
+}
+
+impl Stream for BinnedEventsTimeweightStream {
+    type Item = Sitemty<Box<dyn BinningggContainerBinsDyn>>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        use ControlFlow::*;
+        use Poll::*;
+        loop {
+            break match self.as_mut().inp.poll_next_unpin(cx) {
+                Ready(Some(x)) => match self.as_mut().handle_sitemty(x, cx) {
+                    Continue(()) => continue,
+                    Break(x) => x,
+                },
+                Ready(None) => self.handle_eos(cx),
+                Pending => Pending,
+            };
+        }
+    }
+}
diff --git a/crates/items_2/src/binning/valuetype.rs b/crates/items_2/src/binning/valuetype.rs
index aec2e29..5e8bf91 100644
--- a/crates/items_2/src/binning/valuetype.rs
+++ b/crates/items_2/src/binning/valuetype.rs
@@ -2,8 +2,8 @@ use super::aggregator::AggregatorTimeWeight;
 use super::binnedvaluetype::BinnedNumericValue;
 use super::container_events::Container;
 use super::container_events::EventValueType;
-use crate::vecpreview::PreviewRange;
 use core::fmt;
+use items_0::vecpreview::PreviewRange;
 use netpod::DtNano;
 use netpod::EnumVariant;
 use serde::Deserialize;
@@ -18,7 +18,7 @@ pub struct EnumVariantContainer {
 
 impl PreviewRange for EnumVariantContainer {
     fn preview<'a>(&'a self) -> Box<dyn fmt::Debug + 'a> {
-        let ret = crate::vecpreview::PreviewCell {
+        let ret = items_0::vecpreview::PreviewCell {
             a: self.ixs.front(),
             b: self.ixs.back(),
         };
diff --git a/crates/items_2/src/binsdim0.rs b/crates/items_2/src/binsdim0.rs
index fecf27d..46f1a5e 100644
--- a/crates/items_2/src/binsdim0.rs
+++ b/crates/items_2/src/binsdim0.rs
@@ -2,7 +2,6 @@ use crate::timebin::TimeBinnerCommonV0Func;
 use crate::timebin::TimeBinnerCommonV0Trait;
 use crate::ts_offs_from_abs;
 use crate::ts_offs_from_abs_with_anchor;
-use crate::vecpreview::VecPreview;
 use crate::IsoDateTime;
 use crate::RangeOverlapInfo;
 use crate::TimeBinnableType;
@@ -25,6 +24,7 @@ use items_0::timebin::TimeBinned;
 use items_0::timebin::TimeBinner;
 use items_0::timebin::TimeBinnerTy;
 use items_0::timebin::TimeBins;
+use items_0::vecpreview::VecPreview;
 use items_0::AppendAllFrom;
 use items_0::AppendEmptyBin;
 use items_0::AsAnyMut;
@@ -134,6 +134,10 @@ where
 
 impl<NTY: ScalarOps> BinsDim0<NTY> {
     pub fn push(&mut self, ts1: u64, ts2: u64, count: u64, min: NTY, max: NTY, avg: f32, lst: NTY) {
+        if avg < min.as_prim_f32_b() || avg > max.as_prim_f32_b() {
+            // TODO rounding issues?
+            debug!("bad avg");
+        }
         self.ts1s.push_back(ts1);
         self.ts2s.push_back(ts2);
         self.cnts.push_back(count);
@@ -534,12 +538,19 @@ where
         if self.cnt == 0 && !push_empty {
             self.reset_agg();
         } else {
+            let min = self.min.clone();
+            let max = self.max.clone();
+            let avg = self.avg as f32;
+            if avg < min.as_prim_f32_b() || avg > max.as_prim_f32_b() {
+                // TODO rounding issues?
+                debug!("bad avg");
+            }
             self.out.ts1s.push_back(self.ts1now.ns());
             self.out.ts2s.push_back(self.ts2now.ns());
             self.out.cnts.push_back(self.cnt);
-            self.out.mins.push_back(self.min.clone());
-            self.out.maxs.push_back(self.max.clone());
-            self.out.avgs.push_back(self.avg as f32);
+            self.out.mins.push_back(min);
+            self.out.maxs.push_back(max);
+            self.out.avgs.push_back(avg);
             self.out.lsts.push_back(self.lst.clone());
             self.reset_agg();
         }
diff --git a/crates/items_2/src/channelevents.rs b/crates/items_2/src/channelevents.rs
index 8ff50c0..b48b57a 100644
--- a/crates/items_2/src/channelevents.rs
+++ b/crates/items_2/src/channelevents.rs
@@ -1023,6 +1023,10 @@ impl Events for ChannelEvents {
             Status(x) => panic!("ChannelEvents::to_dim0_f32_for_binning"),
         }
     }
+
+    fn to_container_events(&self) -> Box<dyn ::items_0::timebin::BinningggContainerEventsDyn> {
+        panic!("should not get used")
+    }
 }
 
 impl Collectable for ChannelEvents {
diff --git a/crates/items_2/src/eventfull.rs b/crates/items_2/src/eventfull.rs
index af599b5..e9bcbf6 100644
--- a/crates/items_2/src/eventfull.rs
+++ b/crates/items_2/src/eventfull.rs
@@ -270,6 +270,7 @@ pub enum DecompError {
     UnusedBytes,
     BitshuffleError,
     ShapeMakesNoSense,
+    UnexpectedCompressedScalarValue,
 }
 
 fn decompress(databuf: &[u8], type_size: u32) -> Result<Vec<u8>, DecompError> {
@@ -325,10 +326,18 @@ impl EventFull {
     /// but we still don't know whether that's an image or a waveform.
     /// Therefore, the function accepts the expected shape to at least make an assumption
     /// about whether this is an image or a waveform.
-    pub fn shape_derived(&self, i: usize, shape_exp: &Shape) -> Result<Shape, DecompError> {
+    pub fn shape_derived(
+        &self,
+        i: usize,
+        scalar_type_exp: &ScalarType,
+        shape_exp: &Shape,
+    ) -> Result<Shape, DecompError> {
         match shape_exp {
             Shape::Scalar => match &self.comps[i] {
-                Some(_) => Err(DecompError::ShapeMakesNoSense),
+                Some(_) => match scalar_type_exp {
+                    ScalarType::STRING => Ok(Shape::Scalar),
+                    _ => Err(DecompError::UnexpectedCompressedScalarValue),
+                },
                 None => Ok(Shape::Scalar),
             },
             Shape::Wave(_) => match &self.shapes[i] {
diff --git a/crates/items_2/src/eventsdim0.rs b/crates/items_2/src/eventsdim0.rs
index cd76288..70d4347 100644
--- a/crates/items_2/src/eventsdim0.rs
+++ b/crates/items_2/src/eventsdim0.rs
@@ -760,6 +760,31 @@ impl<STY: ScalarOps> EventsDim0Aggregator<STY> {
             } else {
                 lst.as_prim_f32_b()
             };
+            let max = if min > max {
+                // TODO count
+                debug!("min > max");
+                min.clone()
+            } else {
+                max
+            };
+            let avg = {
+                let g = min.as_prim_f32_b();
+                if avg < g {
+                    debug!("avg < min");
+                    g
+                } else {
+                    avg
+                }
+            };
+            let avg = {
+                let g = max.as_prim_f32_b();
+                if avg > g {
+                    debug!("avg > max");
+                    g
+                } else {
+                    avg
+                }
+            };
             let ret = if self.range.is_time() {
                 BinsDim0 {
                     ts1s: [range_beg].into(),
@@ -1078,6 +1103,14 @@ impl<STY: ScalarOps> Events for EventsDim0<STY> {
         }
         Box::new(ret)
     }
+
+    fn to_container_events(&self) -> Box<dyn ::items_0::timebin::BinningggContainerEventsDyn> {
+        // let tss = self.tss.iter().map(|&x| TsNano::from_ns(x)).collect();
+        // let vals = self.values.clone();
+        // let ret = crate::binning::container_events::ContainerEvents::from_constituents(tss, vals);
+        // Box::new(ret)
+        todo!()
+    }
 }
 
 #[derive(Debug)]
diff --git a/crates/items_2/src/eventsdim0enum.rs b/crates/items_2/src/eventsdim0enum.rs
index 837abfa..f3c59cc 100644
--- a/crates/items_2/src/eventsdim0enum.rs
+++ b/crates/items_2/src/eventsdim0enum.rs
@@ -499,4 +499,8 @@ impl Events for EventsDim0Enum {
     fn to_dim0_f32_for_binning(&self) -> Box<dyn Events> {
         todo!("{}::to_dim0_f32_for_binning", self.type_name())
     }
+
+    fn to_container_events(&self) -> Box<dyn ::items_0::timebin::BinningggContainerEventsDyn> {
+        todo!("{}::to_container_events", self.type_name())
+    }
 }
diff --git a/crates/items_2/src/eventsdim1.rs b/crates/items_2/src/eventsdim1.rs
index 8e20753..11ec1fa 100644
--- a/crates/items_2/src/eventsdim1.rs
+++ b/crates/items_2/src/eventsdim1.rs
@@ -993,6 +993,10 @@ impl<STY: ScalarOps> Events for EventsDim1<STY> {
     fn to_dim0_f32_for_binning(&self) -> Box<dyn Events> {
         todo!("{}::to_dim0_f32_for_binning", self.type_name())
     }
+
+    fn to_container_events(&self) -> Box<dyn ::items_0::timebin::BinningggContainerEventsDyn> {
+        todo!("{}::to_container_events", self.type_name())
+    }
 }
 
 #[derive(Debug)]
diff --git a/crates/items_2/src/eventsxbindim0.rs b/crates/items_2/src/eventsxbindim0.rs
index 30ca169..accfaea 100644
--- a/crates/items_2/src/eventsxbindim0.rs
+++ b/crates/items_2/src/eventsxbindim0.rs
@@ -381,6 +381,10 @@ impl<STY: ScalarOps> Events for EventsXbinDim0<STY> {
     fn to_dim0_f32_for_binning(&self) -> Box<dyn Events> {
         todo!("{}::to_dim0_f32_for_binning", self.type_name())
     }
+
+    fn to_container_events(&self) -> Box<dyn ::items_0::timebin::BinningggContainerEventsDyn> {
+        todo!("{}::to_container_events", self.type_name())
+    }
 }
 
 #[derive(Debug)]
diff --git a/crates/items_2/src/vecpreview.rs b/crates/items_2/src/vecpreview.rs
index 74f23ec..8b13789 100644
--- a/crates/items_2/src/vecpreview.rs
+++ b/crates/items_2/src/vecpreview.rs
@@ -1,53 +1 @@
-use core::fmt;
-use std::collections::VecDeque;
 
-pub struct PreviewCell<'a, T> {
-    pub a: Option<&'a T>,
-    pub b: Option<&'a T>,
-}
-
-impl<'a, T> fmt::Debug for PreviewCell<'a, T>
-where
-    T: fmt::Debug,
-{
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        match (self.a.as_ref(), self.b.as_ref()) {
-            (Some(a), Some(b)) => write!(fmt, "{:?} .. {:?}", a, b),
-            (Some(a), None) => write!(fmt, "{:?}", a),
-            _ => write!(fmt, "(empty)"),
-        }
-    }
-}
-
-pub trait PreviewRange {
-    fn preview<'a>(&'a self) -> Box<dyn fmt::Debug + 'a>;
-}
-
-impl<T> PreviewRange for VecDeque<T>
-where
-    T: fmt::Debug,
-{
-    fn preview<'a>(&'a self) -> Box<dyn fmt::Debug + 'a> {
-        let ret = PreviewCell {
-            a: self.front(),
-            b: if self.len() <= 1 { None } else { self.back() },
-        };
-        Box::new(ret)
-    }
-}
-
-pub struct VecPreview<'a> {
-    c: &'a dyn PreviewRange,
-}
-
-impl<'a> VecPreview<'a> {
-    pub fn new(c: &'a dyn PreviewRange) -> Self {
-        Self { c }
-    }
-}
-
-impl<'a> fmt::Debug for VecPreview<'a> {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        write!(fmt, "{:?}", self.c.preview())
-    }
-}
diff --git a/crates/nodenet/src/conn.rs b/crates/nodenet/src/conn.rs
index d363e5a..b1a350d 100644
--- a/crates/nodenet/src/conn.rs
+++ b/crates/nodenet/src/conn.rs
@@ -279,7 +279,7 @@ pub fn events_parse_input_query(frames: Vec<InMemoryFrame>) -> Result<(EventsSub
         },
         Err(e) => return Err(e.into()),
     };
-    info!("parsing json {:?}", qitem.str());
+    trace!("parsing json {:?}", qitem.str());
     let frame1: Frame1Parts = serde_json::from_str(&qitem.str()).map_err(|_e| {
         let e = Error::BadQuery;
         error!("{e}");
diff --git a/crates/query/src/api4/events.rs b/crates/query/src/api4/events.rs
index 89560ff..17977cc 100644
--- a/crates/query/src/api4/events.rs
+++ b/crates/query/src/api4/events.rs
@@ -537,7 +537,7 @@ impl EventsSubQuery {
     }
 
     pub fn need_one_before_range(&self) -> bool {
-        self.select.one_before_range
+        self.select.one_before_range | self.transform().need_one_before_range()
     }
 
     pub fn transform(&self) -> &TransformQuery {
diff --git a/crates/scyllaconn/src/bincache.rs b/crates/scyllaconn/src/bincache.rs
index 78ede96..b7a2120 100644
--- a/crates/scyllaconn/src/bincache.rs
+++ b/crates/scyllaconn/src/bincache.rs
@@ -7,6 +7,7 @@ use err::Error;
 use futures_util::Future;
 use futures_util::Stream;
 use futures_util::StreamExt;
+use items_0::timebin::BinsBoxed;
 use items_0::timebin::TimeBinned;
 use items_0::Empty;
 use items_2::binsdim0::BinsDim0;
@@ -227,12 +228,14 @@ impl streams::timebin::CacheReadProvider for ScyllaCacheReadProvider {
         offs: Range<u32>,
     ) -> streams::timebin::cached::reader::CacheReading {
         let scyqueue = self.scyqueue.clone();
-        let fut = async move { scyqueue.read_cache_f32(series, bin_len, msp, offs).await };
+        // let fut = async move { scyqueue.read_cache_f32(series, bin_len, msp, offs).await };
+        let fut = async { todo!("TODO impl scylla cache read") };
         streams::timebin::cached::reader::CacheReading::new(Box::pin(fut))
     }
 
-    fn write(&self, series: u64, bins: BinsDim0<f32>) -> streams::timebin::cached::reader::CacheWriting {
+    fn write(&self, series: u64, bins: BinsBoxed) -> streams::timebin::cached::reader::CacheWriting {
         let scyqueue = self.scyqueue.clone();
+        let bins = todo!("TODO impl scylla cache write");
         let fut = async move { scyqueue.write_cache_f32(series, bins).await };
         streams::timebin::cached::reader::CacheWriting::new(Box::pin(fut))
     }
diff --git a/crates/streams/src/generators.rs b/crates/streams/src/generators.rs
index e9c341e..60392f5 100644
--- a/crates/streams/src/generators.rs
+++ b/crates/streams/src/generators.rs
@@ -85,7 +85,7 @@ fn make_test_channel_events_stream_data_inner(
     debug!("use test backend data");
     let chn = subq.name();
     let range = subq.range().clone();
-    let one_before = subq.transform().need_one_before_range();
+    let one_before = subq.need_one_before_range();
     if chn == "test-gen-i32-dim0-v00" {
         Ok(Box::pin(GenerateI32V00::new(node_ix, node_count, range, one_before)))
     } else if chn == "test-gen-i32-dim0-v01" {
diff --git a/crates/streams/src/rangefilter2.rs b/crates/streams/src/rangefilter2.rs
index beb9620..50f16cd 100644
--- a/crates/streams/src/rangefilter2.rs
+++ b/crates/streams/src/rangefilter2.rs
@@ -39,7 +39,7 @@ where
     inp: S,
     range: NanoRange,
     range_str: String,
-    one_before_range: bool,
+    one_before: bool,
     stats: RangeFilterStats,
     slot1: Option<ITY>,
     have_range_complete: bool,
@@ -59,20 +59,20 @@ where
         std::any::type_name::<Self>()
     }
 
-    pub fn new(inp: S, range: NanoRange, one_before_range: bool) -> Self {
+    pub fn new(inp: S, range: NanoRange, one_before: bool) -> Self {
         let trdet = false;
         trace_emit!(
             trdet,
-            "{}::new  range: {:?}  one_before_range {:?}",
+            "{}::new  range: {:?}  one_before {:?}",
             Self::type_name(),
             range,
-            one_before_range
+            one_before
         );
         Self {
             inp,
             range_str: format!("{:?}", range),
             range,
-            one_before_range,
+            one_before,
             stats: RangeFilterStats::new(),
             slot1: None,
             have_range_complete: false,
@@ -116,6 +116,11 @@ where
     }
 
     fn handle_item(&mut self, item: ITY) -> Result<ITY, Error> {
+        if let Some(ts_min) = item.ts_min() {
+            if ts_min < self.range.beg() {
+                debug!("ITEM  BEFORE RANGE  (how many?)");
+            }
+        }
         let min = item.ts_min().map(|x| TsNano::from_ns(x).fmt());
         let max = item.ts_max().map(|x| TsNano::from_ns(x).fmt());
         trace_emit!(
@@ -126,7 +131,7 @@ where
             max
         );
         let mut item = self.prune_high(item, self.range.end)?;
-        let ret = if self.one_before_range {
+        let ret = if self.one_before {
             let lige = item.find_lowest_index_ge(self.range.beg);
             trace_emit!(self.trdet, "YES one_before_range  ilge {:?}", lige);
             match lige {
diff --git a/crates/streams/src/timebin/cached/reader.rs b/crates/streams/src/timebin/cached/reader.rs
index af30fe6..c0fb17c 100644
--- a/crates/streams/src/timebin/cached/reader.rs
+++ b/crates/streams/src/timebin/cached/reader.rs
@@ -5,8 +5,7 @@ use futures_util::FutureExt;
 use futures_util::Stream;
 use futures_util::StreamExt;
 use items_0::streamitem::Sitemty;
-use items_0::timebin::TimeBinnable;
-use items_2::binsdim0::BinsDim0;
+use items_0::timebin::BinsBoxed;
 use items_2::channelevents::ChannelEvents;
 use netpod::log::*;
 use netpod::BinnedRange;
@@ -55,19 +54,19 @@ pub trait EventsReadProvider: Send + Sync {
 }
 
 pub struct CacheReading {
-    fut: Pin<Box<dyn Future<Output = Result<BinsDim0<f32>, streams::timebin::cached::reader::Error>> + Send>>,
+    fut: Pin<Box<dyn Future<Output = Result<BinsBoxed, streams::timebin::cached::reader::Error>> + Send>>,
 }
 
 impl CacheReading {
     pub fn new(
-        fut: Pin<Box<dyn Future<Output = Result<BinsDim0<f32>, streams::timebin::cached::reader::Error>> + Send>>,
+        fut: Pin<Box<dyn Future<Output = Result<BinsBoxed, streams::timebin::cached::reader::Error>> + Send>>,
     ) -> Self {
         Self { fut }
     }
 }
 
 impl Future for CacheReading {
-    type Output = Result<BinsDim0<f32>, streams::timebin::cached::reader::Error>;
+    type Output = Result<BinsBoxed, streams::timebin::cached::reader::Error>;
 
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
         self.fut.poll_unpin(cx)
@@ -94,7 +93,7 @@ impl Future for CacheWriting {
 
 pub trait CacheReadProvider: Send + Sync {
     fn read(&self, series: u64, bin_len: DtMs, msp: u64, offs: Range<u32>) -> CacheReading;
-    fn write(&self, series: u64, bins: BinsDim0<f32>) -> CacheWriting;
+    fn write(&self, series: u64, bins: BinsBoxed) -> CacheWriting;
 }
 
 #[derive(Debug, ThisError)]
@@ -112,7 +111,7 @@ pub struct CachedReader {
     ts1next: TsNano,
     bin_len: DtMs,
     cache_read_provider: Arc<dyn CacheReadProvider>,
-    reading: Option<Pin<Box<dyn Future<Output = Result<BinsDim0<f32>, Error>> + Send>>>,
+    reading: Option<Pin<Box<dyn Future<Output = Result<BinsBoxed, Error>> + Send>>>,
 }
 
 impl CachedReader {
@@ -134,7 +133,7 @@ impl CachedReader {
 }
 
 impl Stream for CachedReader {
-    type Item = Result<BinsDim0<f32>, Error>;
+    type Item = Result<BinsBoxed, Error>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
@@ -151,7 +150,6 @@ impl Stream for CachedReader {
                         self.reading = None;
                         match x {
                             Ok(bins) => {
-                                use items_0::WithLen;
                                 trace_emit!(
                                     "- - - - - - - - - - - -  emit cached bins  {}  bin_len {}",
                                     bins.len(),
diff --git a/crates/streams/src/timebin/fromevents.rs b/crates/streams/src/timebin/fromevents.rs
index 8a05d75..3dc81c1 100644
--- a/crates/streams/src/timebin/fromevents.rs
+++ b/crates/streams/src/timebin/fromevents.rs
@@ -6,8 +6,7 @@ use futures_util::StreamExt;
 use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
-use items_2::binsdim0::BinsDim0;
-use items_2::channelevents::ChannelEvents;
+use items_0::timebin::BinsBoxed;
 use netpod::log::*;
 use netpod::BinnedRange;
 use netpod::ChConf;
@@ -26,7 +25,7 @@ macro_rules! trace_emit { ($($arg:tt)*) => ( if true { trace!($($arg)*); } ) }
 pub enum Error {}
 
 pub struct BinnedFromEvents {
-    stream: Pin<Box<dyn Stream<Item = Sitemty<BinsDim0<f32>>> + Send>>,
+    stream: Pin<Box<dyn Stream<Item = Sitemty<BinsBoxed>> + Send>>,
 }
 
 impl BinnedFromEvents {
@@ -41,33 +40,28 @@ impl BinnedFromEvents {
             panic!();
         }
         let stream = read_provider.read(evq, chconf);
-        let stream = stream.map(|x| {
-            let x = items_0::try_map_sitemty_data!(x, |x| match x {
-                ChannelEvents::Events(x) => {
-                    let x = x.to_dim0_f32_for_binning();
-                    Ok(ChannelEvents::Events(x))
-                }
-                ChannelEvents::Status(x) => Ok(ChannelEvents::Status(x)),
-            });
-            x
-        });
-        let stream = Box::pin(stream);
-        let stream = super::basic::TimeBinnedStream::new(stream, netpod::BinnedRangeEnum::Time(range), do_time_weight);
+        // let stream = stream.map(|x| {
+        //     let x = items_0::try_map_sitemty_data!(x, |x| match x {
+        //         ChannelEvents::Events(x) => {
+        //             let x = x.to_dim0_f32_for_binning();
+        //             Ok(ChannelEvents::Events(x))
+        //         }
+        //         ChannelEvents::Status(x) => Ok(ChannelEvents::Status(x)),
+        //     });
+        //     x
+        // });
+        let stream = if do_time_weight {
+            let stream = Box::pin(stream);
+            items_2::binning::timeweight::timeweight_events_dyn::BinnedEventsTimeweightStream::new(range, stream)
+        } else {
+            panic!("non-weighted TODO")
+        };
         let stream = stream.map(|item| match item {
             Ok(x) => match x {
                 StreamItem::DataItem(x) => match x {
-                    RangeCompletableItem::Data(mut x) => {
-                        // TODO need a typed time binner
-                        if let Some(x) = x.as_any_mut().downcast_mut::<BinsDim0<f32>>() {
-                            let y = x.clone();
-                            use items_0::WithLen;
-                            trace_emit!("===========  =========  emit from events {}", y.len());
-                            Ok(StreamItem::DataItem(RangeCompletableItem::Data(y)))
-                        } else {
-                            Err(::err::Error::with_msg_no_trace(
-                                "GapFill expects incoming BinsDim0<f32>",
-                            ))
-                        }
+                    RangeCompletableItem::Data(x) => {
+                        debug!("see item {:?}", x);
+                        Ok(StreamItem::DataItem(RangeCompletableItem::Data(x)))
                     }
                     RangeCompletableItem::RangeComplete => {
                         info!("BinnedFromEvents  sees range final");
@@ -87,7 +81,7 @@ impl BinnedFromEvents {
 }
 
 impl Stream for BinnedFromEvents {
-    type Item = Sitemty<BinsDim0<f32>>;
+    type Item = Sitemty<BinsBoxed>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         self.stream.poll_next_unpin(cx)
diff --git a/crates/streams/src/timebin/fromlayers.rs b/crates/streams/src/timebin/fromlayers.rs
index 81d053a..f952787 100644
--- a/crates/streams/src/timebin/fromlayers.rs
+++ b/crates/streams/src/timebin/fromlayers.rs
@@ -12,7 +12,10 @@ use items_0::on_sitemty_data;
 use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
+use items_0::timebin::BinningggContainerBinsDyn;
+use items_0::timebin::BinsBoxed;
 use items_0::timebin::TimeBinnableTy;
+use items_2::binning::timeweight::timeweight_bins_dyn::BinnedBinsTimeweightStream;
 use items_2::binsdim0::BinsDim0;
 use netpod::log::*;
 use netpod::query::CacheUsage;
@@ -44,7 +47,7 @@ pub enum Error {
     FinerGridMismatch(DtMs, DtMs),
 }
 
-type BoxedInput = Pin<Box<dyn Stream<Item = Sitemty<BinsDim0<f32>>> + Send>>;
+type BoxedInput = Pin<Box<dyn Stream<Item = Sitemty<BinsBoxed>> + Send>>;
 
 pub struct TimeBinnedFromLayers {
     ch_conf: ChannelTypeConfigGen,
@@ -141,11 +144,7 @@ impl TimeBinnedFromLayers {
                         cache_read_provider,
                         events_read_provider.clone(),
                     )?;
-                    let inp = super::basic::TimeBinnedStream::new(
-                        Box::pin(inp),
-                        BinnedRangeEnum::Time(range),
-                        do_time_weight,
-                    );
+                    let inp = BinnedBinsTimeweightStream::new(range, Box::pin(inp));
                     let ret = Self {
                         ch_conf,
                         cache_usage,
@@ -200,7 +199,7 @@ impl TimeBinnedFromLayers {
 }
 
 impl Stream for TimeBinnedFromLayers {
-    type Item = Sitemty<BinsDim0<f32>>;
+    type Item = Sitemty<BinsBoxed>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
diff --git a/crates/streams/src/timebin/gapfill.rs b/crates/streams/src/timebin/gapfill.rs
index 12d6324..d2c7d32 100644
--- a/crates/streams/src/timebin/gapfill.rs
+++ b/crates/streams/src/timebin/gapfill.rs
@@ -9,9 +9,7 @@ use futures_util::StreamExt;
 use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
-use items_0::Empty;
-use items_0::WithLen;
-use items_2::binsdim0::BinsDim0;
+use items_0::timebin::BinsBoxed;
 use netpod::log::*;
 use netpod::query::CacheUsage;
 use netpod::range::evrange::NanoRange;
@@ -56,7 +54,7 @@ pub enum Error {
     EventsReader(#[from] super::fromevents::Error),
 }
 
-type INP = Pin<Box<dyn Stream<Item = Sitemty<BinsDim0<f32>>> + Send>>;
+type Input = Pin<Box<dyn Stream<Item = Sitemty<BinsBoxed>> + Send>>;
 
 // Try to read from cache for the given bin len.
 // For gaps in the stream, construct an alternative input from finer bin len with a binner.
@@ -72,10 +70,10 @@ pub struct GapFill {
     range: BinnedRange<TsNano>,
     do_time_weight: bool,
     bin_len_layers: Vec<DtMs>,
-    inp: Option<INP>,
+    inp: Option<Input>,
     inp_range_final: bool,
-    inp_buf: Option<BinsDim0<f32>>,
-    inp_finer: Option<INP>,
+    inp_buf: Option<BinsBoxed>,
+    inp_finer: Option<Input>,
     inp_finer_range_final: bool,
     inp_finer_range_final_cnt: u32,
     inp_finer_range_final_max: u32,
@@ -84,7 +82,7 @@ pub struct GapFill {
     exp_finer_range: NanoRange,
     cache_read_provider: Arc<dyn CacheReadProvider>,
     events_read_provider: Arc<dyn EventsReadProvider>,
-    bins_for_cache_write: BinsDim0<f32>,
+    bins_for_cache_write: Option<BinsBoxed>,
     done: bool,
     cache_writing: Option<super::cached::reader::CacheWriting>,
 }
@@ -114,7 +112,7 @@ impl GapFill {
                     Ok(x) => Ok(StreamItem::DataItem(RangeCompletableItem::Data(x))),
                     Err(e) => Err(::err::Error::from_string(e)),
                 });
-            Box::pin(stream) as Pin<Box<dyn Stream<Item = Sitemty<BinsDim0<f32>>> + Send>>
+            Box::pin(stream) as Pin<Box<dyn Stream<Item = Sitemty<BinsBoxed>> + Send>>
         } else {
             let stream = futures_util::stream::empty();
             Box::pin(stream)
@@ -144,36 +142,33 @@ impl GapFill {
             exp_finer_range: NanoRange { beg: 0, end: 0 },
             cache_read_provider,
             events_read_provider,
-            bins_for_cache_write: BinsDim0::empty(),
+            bins_for_cache_write: None,
             done: false,
             cache_writing: None,
         };
         Ok(ret)
     }
 
-    fn handle_bins_finer(mut self: Pin<&mut Self>, bins: BinsDim0<f32>) -> Result<BinsDim0<f32>, Error> {
+    fn handle_bins_finer(mut self: Pin<&mut Self>, bins: BinsBoxed) -> Result<BinsBoxed, Error> {
         trace_handle!("{}  handle_bins_finer  {}", self.dbgname, bins);
-        for (&ts1, &ts2) in bins.ts1s.iter().zip(&bins.ts2s) {
+        for (&ts1, &ts2) in bins.edges_iter() {
             if let Some(last) = self.last_bin_ts2 {
-                if ts1 != last.ns() {
-                    return Err(Error::GapFromFiner(
-                        TsNano::from_ns(ts1),
-                        last,
-                        self.range.bin_len_dt_ms(),
-                    ));
+                if ts1 != last {
+                    return Err(Error::GapFromFiner(ts1, last, self.range.bin_len_dt_ms()));
                 }
-            } else if ts1 != self.range.nano_beg().ns() {
+            } else if ts1 != self.range.nano_beg() {
                 return Err(Error::MissingBegFromFiner(
-                    TsNano::from_ns(ts1),
+                    ts1,
                     self.range.nano_beg(),
                     self.range.bin_len_dt_ms(),
                 ));
             }
-            self.last_bin_ts2 = Some(TsNano::from_ns(ts2));
+            self.last_bin_ts2 = Some(ts2);
         }
         if bins.len() != 0 {
             let mut bins2 = bins.clone();
-            bins2.drain_into(&mut self.bins_for_cache_write, 0..bins2.len());
+            let dst = self.bins_for_cache_write.get_or_insert_with(|| bins.empty());
+            bins2.drain_into(dst.as_mut(), 0..bins2.len());
         }
         if self.cache_usage.is_cache_write() {
             self.cache_write_intermediate()?;
@@ -191,34 +186,34 @@ impl GapFill {
         Ok(())
     }
 
-    fn handle_bins(mut self: Pin<&mut Self>, bins: BinsDim0<f32>) -> Result<BinsDim0<f32>, Error> {
+    fn handle_bins(mut self: Pin<&mut Self>, bins: BinsBoxed) -> Result<BinsBoxed, Error> {
         trace_handle!("{}  handle_bins  {}", self.dbgname, bins);
         // TODO could use an interface to iterate over opaque bin items that only expose
         // edge and count information with all remaining values opaque.
-        for (i, (&ts1, &ts2)) in bins.ts1s.iter().zip(&bins.ts2s).enumerate() {
-            if ts1 < self.range.nano_beg().ns() {
+        for (i, (&ts1, &ts2)) in bins.edges_iter().enumerate() {
+            if ts1 < self.range.nano_beg() {
                 return Err(Error::InputBeforeRange(
-                    NanoRange::from_ns_u64(ts1, ts2),
+                    NanoRange::from_ns_u64(ts1.ns(), ts2.ns()),
                     self.range.clone(),
                 ));
             }
             if let Some(last) = self.last_bin_ts2 {
-                if ts1 != last.ns() {
+                if ts1 != last {
                     trace_handle!("{}  detect a gap  BETWEEN  last {}  ts1 {}", self.dbgname, last, ts1);
-                    let mut ret = <BinsDim0<f32> as items_0::Empty>::empty();
+                    let mut ret = bins.empty();
                     let mut bins = bins;
-                    bins.drain_into(&mut ret, 0..i);
+                    bins.drain_into(ret.as_mut(), 0..i);
                     self.inp_buf = Some(bins);
                     let range = NanoRange {
                         beg: last.ns(),
-                        end: ts1,
+                        end: ts1.ns(),
                     };
                     self.setup_sub(range)?;
                     return Ok(ret);
                 } else {
                     // nothing to do
                 }
-            } else if ts1 != self.range.nano_beg().ns() {
+            } else if ts1 != self.range.nano_beg() {
                 trace_handle!(
                     "{}  detect a gap  BEGIN  beg {}  ts1 {}",
                     self.dbgname,
@@ -227,12 +222,12 @@ impl GapFill {
                 );
                 let range = NanoRange {
                     beg: self.range.nano_beg().ns(),
-                    end: ts1,
+                    end: ts1.ns(),
                 };
                 self.setup_sub(range)?;
-                return Ok(BinsDim0::empty());
+                return Ok(bins.empty());
             }
-            self.last_bin_ts2 = Some(TsNano::from_ns(ts2));
+            self.last_bin_ts2 = Some(ts2);
         }
         Ok(bins)
     }
@@ -270,10 +265,12 @@ impl GapFill {
                 self.events_read_provider.clone(),
             )?;
             let stream = Box::pin(inp_finer);
-            let do_time_weight = self.do_time_weight;
             let range = BinnedRange::from_nano_range(range_finer.full_range(), self.range.bin_len.to_dt_ms());
-            let stream =
-                super::basic::TimeBinnedStream::new(stream, netpod::BinnedRangeEnum::Time(range), do_time_weight);
+            let stream = if self.do_time_weight {
+                ::items_2::binning::timeweight::timeweight_bins_dyn::BinnedBinsTimeweightStream::new(range, stream)
+            } else {
+                panic!("TODO unweighted")
+            };
             self.inp_finer = Some(Box::pin(stream));
         } else {
             debug_setup!("{}  setup_inp_finer  next finer from events  {}", self.dbgname, range);
@@ -309,7 +306,7 @@ impl GapFill {
         Ok(())
     }
 
-    fn cache_write(mut self: Pin<&mut Self>, bins: BinsDim0<f32>) -> Result<(), Error> {
+    fn cache_write(mut self: Pin<&mut Self>, bins: BinsBoxed) -> Result<(), Error> {
         self.cache_writing = Some(self.cache_read_provider.write(self.series, bins));
         Ok(())
     }
@@ -318,42 +315,27 @@ impl GapFill {
         if self.inp_finer_fills_gap {
             // TODO can consider all incoming bins as final by assumption.
         }
-        let aa = &self.bins_for_cache_write;
-        if aa.len() >= 2 {
-            for (i, (&c1, &_c2)) in aa.cnts.iter().rev().zip(aa.cnts.iter().rev().skip(1)).enumerate() {
-                if c1 != 0 {
-                    let n = aa.len() - (1 + i);
-                    debug_cache!("{}  cache_write_on_end  consider {} for write", self.dbgname, n);
-                    let mut bins_write = BinsDim0::empty();
-                    self.bins_for_cache_write.drain_into(&mut bins_write, 0..n);
-                    self.cache_write(bins_write)?;
-                    break;
-                }
+        if let Some(bins) = &self.bins_for_cache_write {
+            if bins.len() >= 2 {
+                // TODO guard behind flag.
+                // TODO emit to a async user-given channel, if given.
+                // Therefore, move to poll loop.
+                // Should only write to cache with non-zero count, therefore, not even emit others?
+                // TODO afterwards set to None.
+                self.bins_for_cache_write = None;
             }
         }
         Ok(())
     }
 
-    fn cache_write_intermediate(mut self: Pin<&mut Self>) -> Result<(), Error> {
-        let aa = &self.bins_for_cache_write;
-        if aa.len() >= 2 {
-            for (i, (&c1, &_c2)) in aa.cnts.iter().rev().zip(aa.cnts.iter().rev().skip(1)).enumerate() {
-                if c1 != 0 {
-                    let n = aa.len() - (1 + i);
-                    debug_cache!("{}  cache_write_intermediate  consider {} for write", self.dbgname, n);
-                    let mut bins_write = BinsDim0::empty();
-                    self.bins_for_cache_write.drain_into(&mut bins_write, 0..n);
-                    self.cache_write(bins_write)?;
-                    break;
-                }
-            }
-        }
+    fn cache_write_intermediate(self: Pin<&mut Self>) -> Result<(), Error> {
+        // TODO See cache_write_on_end
         Ok(())
     }
 }
 
 impl Stream for GapFill {
-    type Item = Sitemty<BinsDim0<f32>>;
+    type Item = Sitemty<BinsBoxed>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
diff --git a/crates/streams/src/timebinnedjson.rs b/crates/streams/src/timebinnedjson.rs
index ae3bb45..6ba5478 100644
--- a/crates/streams/src/timebinnedjson.rs
+++ b/crates/streams/src/timebinnedjson.rs
@@ -361,9 +361,9 @@ async fn timebinned_stream(
             )
             .map_err(Error::from_string)?;
             let stream = stream.map(|item| {
-                on_sitemty_data!(item, |k| Ok(StreamItem::DataItem(RangeCompletableItem::Data(
-                    Box::new(k) as Box<dyn TimeBinned>
-                ))))
+                on_sitemty_data!(item, |k: items_0::timebin::BinsBoxed| Ok(StreamItem::DataItem(
+                    RangeCompletableItem::Data(k.to_old_time_binned())
+                )))
             });
             let stream: Pin<Box<dyn Stream<Item = Sitemty<Box<dyn TimeBinned>>> + Send>> = Box::pin(stream);
             Ok(stream)