The unmerged scaled fulls the final merge hands back for the .hkl were gathered by one thread
pushing back over every full. Which fulls is now KeptIndices (the same list, in the same order),
and each record is made side by side.
The same records in the same order: p.mtz and the .hkl byte-identical (myob, thau, cytc, kdp,
cytc -N 4 / -N 8, --prepass-fraction 1 on four sets, 8a1a, 8tyy, CPU build myob). 8a1a, no other
load, interleaved: the P61 merge's statistics stage 3.94 -> 3.71 s.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SVmAWnzCmRKAXVUCdc4iNi