Problem/Motivation
Follow up from #1845546-121: Implement validation for the TypedData API
Maybe also improve how we deal with multiple-bundle metadata here?
Steps to reproduce
N/A
Proposed resolution
See #20 + #23.
Remaining tasks
TBD
User interface changes
None.
API changes
Passing a string value to the Bundle constraint's bundle option is no longer allowed; it triggers a deprecation in Drupal 10.3 and will trigger an error in Drupal 11.
Data model changes
None.
Release notes snippet
None.