A first pass at Odin's vendored CultCache compared only its uncommitted diff
against CultLib and concluded nothing else was missing. That was wrong: a
whole-file symbol comparison found CultCacheExpectedEnvelope and a per-entry
compare_exchange that CultLib lacks and Odin's crates import. Comparing a diff
tells you what changed recently, not what the fork uniquely holds.
Unlike the snapshot form this constrains only the identities it names, so an
unrelated concurrent write does not lose the race. Expecting `None` makes it a
create-once claim, which is what an admitted-generation owner needs.
The expectation-identity guard is carried over as written even though it is
unreachable: a condition whose envelope names a different identity is already
rejected by the value comparison above it. Left in place rather than quietly
dropped, since it costs nothing and the lookup it depends on may change.
cultcache-rs: 53 tests.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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