Fix: Allow f.object().array() as input field

[google-labs-jules]

This change fixes a validation error that occurred when using f.object().array() as an input field. The validation logic was missing a case for the object type, which caused an error when f.object().array() was used as an input field. This commit adds the missing case to the validation logic and includes a test to verify the fix.

Fixes #446

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PR created automatically by Jules for task 7279648232545122725 started by @dosco

[google-labs-jules]

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