ResourceResponse should treat \stdClass as an array. Otherwise we receive an exception because we cannot find a normalizer.
I found this problem while working on #2403307: RPC endpoints for user authentication: log in, check login status, log out → because I need to use a stdClass object with the current user and session data.
Patch attached.
Closed: works as designed
8.4 ⚰️
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
One reason to support stdClass explained in https://medium.com/@joshirohit100/drupal-8-custom-normalizer-c9d71c06c6e
We are supporting this today using custom normaliser, it would be great to have support in CORE.