Version TBD

Generalized several errors into a single cannot-modify-read-only-value error (T366239)
Generalized several errors into a single invalid-value error (T366181)
Generalized several errors into a single missing-field error (T366177)
Modified the patch-target-not-found error (T366911)
- Changed message to Target not found on resource
- Changed context object - replaced operation and field fields with path
Modified the redirected-item error (T366910)
- Changed message to Item {item_id} has been redirected to {redirect_target_id}
- Added a context object with a redirect-target field
Modified the patch-test-failed error (T366905)
- Changed message to Test operation in the provided patch failed
- Changed context object - replaced operation field with path

Version 0.4

Added endpoint PATCH /wikibase/v0/entities/items/{item_id} (T342993)
Generalized several errors into a single invalid-path-parameter error (T366172)
Generalized several errors into a single invalid-query-parameter error (T366175)