fix issue with read builtin delimiter in invaild mutibyte char; fix crash if caller passes negative count argument to one of the history file writing functions

doc/bash.1

@@ -5,14 +5,14 @@
 .\"	Case Western Reserve University
 .\"	chet.ramey@case.edu
 .\"
-.\"	Last Change: Mon Jul 29 11:19:45 EDT 2024
+.\"	Last Change: Wed Aug  7 09:57:34 EDT 2024
 .\"
 .\" bash_builtins, strip all but Built-Ins section
 .\" avoid a warning about an undefined register
 .\" .if !rzY .nr zY 0
 .if \n(zZ=1 .ig zZ
 .if \n(zY=1 .ig zY
-.TH BASH 1 "2024 July 29" "GNU Bash 5.3"
+.TH BASH 1 "2024 August 7" "GNU Bash 5.3"
 .\"
 .ie \n(.g \{\
 .ds ' \(aq
@@ -2091,7 +2091,7 @@ the value returned upon subsequent
 references is
 the number of seconds since the assignment plus the value assigned.
 The number of seconds at shell invocation and the current time are always
-determined by querying the system clock.
+determined by querying the system clock at one-second resolution.
 If
 .SM
 .B SECONDS