A write owns the record at its key when the written type declares the
record's schema id, or reads an older undeclared id of its own schema name
whole (ruling own-entry-reads-whole); every other registered type's record
is refused, in every cache, with or without a backing store
(cache-refuses-retype).
Removing a record and adding one of another type in a single batch is
staged as the held record's eviction then the add, so validators, Claim,
the store judges and the change journal see what they see staged apart
(one-batch-retype-is-eviction-then-add); Watch<old> gets Removed and
Watch<new> Added. A one-batch retype across home stores is refused by the
batch-spans rule and must be staged apart. A variant rebase changes type
exactly where a plain write may (variant-rebase-follows-plain-write).
Store kinds outside the library get one protected per-key judge
(store-kind-per-key-judge), exercised by tests/GameCult.Caching.OutsideStoreTests.
Spec variants:cut_spec:cut-write-ownership-cs.r1; reports h1-h5;
Soul s5 clears the merge (verdict variants:verdict:cut-write-ownership-cs.s5).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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