The cut was marked with U+2026, which NFKC decomposes into three dots —
so re-sanitising a truncated string grew it by two characters and re-cut
it at a different word boundary. A title would quietly rewrite itself
every time the event was re-ingested, and the module promises
idempotency in its own docstring.
Append what normalisation would produce instead. The existing corpus
missed this because its only over-length entry has no space in its last
40%, so it happened to re-truncate to the identical string; the new test
uses prose.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
