The block scan replaced each note's witness list with the result of
split_off(), which allocates a new buffer on every call: every block,
each note with history paid an allocation and, once its list was full, a
copy of all 100 entries.
The duplicate of the newest witness is now pushed and, when the list
exceeds 100 entries, the oldest is drained in place; notes with no
history are skipped. The list keeps the same entries in the same order,
so nothing in the output changes.
The witness tests and the oracle pass, and a differential run against
the unmodified backend is byte-identical (every witness entry and the
whole saved file after every operation) apart from the lists the
previous commit clears.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
DanSandClaude Opus 5.5
e7ebc568b0