[wp-trac] [WordPress Trac] #64247: REST API: `class_list` sometimes returned as an object

[WordPress Trac]

#64247: REST API: `class_list` sometimes returned as an object
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 Reporter:  dlh           |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  6.6
 Severity:  normal        |   Keywords:
  Focuses:                |
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 The `class_list` property in the REST API posts endpoint returns the array
 of classes generated by `get_post_class()`. The final step in
 `get_post_class()` is to run `array_unique()` over the array, which
 removes duplicate classes but doesn't reset the array keys, usually
 causing the keys to become non-sequential, and in turn causing the array
 to be converted to a JSON object in the REST response. See the attached
 screenshot showing an API response from a site affected by this issue.

 (A similar problem was fixed just the other day in [61210].)

 The linked PR would address the issue within the controller, since the
 array needs to be indexed at that point no matter how the list of classes
 is generated.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64247>
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