- RefuseVariantIndexSharing built its holder list per landing record by scanning
every landing record, so opening a store with one variant was quadratic. It now
groups what lands once and looks each (index, value) up once. Pinned by a count
of index-accessor reads at two sizes, not a clock.
- JudgeMerge decoded every unseen disk record before Resolve could exit early,
so a plain-only store failed a conditional commit on another writer's schema it
does not register. It now judges only when the batch, the disk (by the record's
variant header, never its payload) or this cache holds a variant.
- Plain duplicates find the holder with the smallest key (ordinal), so the choice
is the same live, after a flush and after a reopen. The comment claiming "most
recently indexed" was wrong across reload.
- A dropped slot is reported once per record, not once by the schema diff and
again by the variant.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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