OptionalbaseOptionalchangedComponent keys whose sub-hash differs between base and head. Present
only when both fingerprints carry components (sub-hash mode); a key
present on one side only counts as changed.
Which signals changed — non-empty only when state === 'modified'. Useful
for an inspect panel ("Geometry, Data") even though the colour is driven
by state.
OptionalheadThe entity in the head revision (added / modified / unchanged).
The entity's stable key (its EntityFingerprint.key).
The entity in the base revision (deleted / modified / unchanged).