Description

Block attributes can have multiple types (i.e. string or boolean), which is encoded in block.json as an array. The current type does not allow for that

Step-by-step reproduction instructions

1. Try to pass an array of strings as the type of a block attribute
2. Observe that that does not work

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure