[wp-trac] [WordPress Trac] #22746: The metadata_exists() function should return the correct value if the get_$meta_type_metadata filter returns a non null value

[WordPress Trac]

#22746: The metadata_exists() function should return the correct value if the
get_$meta_type_metadata filter returns a non null value
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 Reporter:  xknown                             |       Owner:
     Type:  defect (bug)                       |      Status:  new
 Priority:  normal                             |   Milestone:  3.9
Component:  Options, Meta APIs                 |     Version:
 Severity:  normal                             |  Resolution:
 Keywords:  has-patch commit needs-unit-tests  |     Focuses:
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Comment (by SergeyBiryukov):

 > Cast to bool to match the metadata_exists() documentation.

 I think the documentation should be changed to `@return mixed` instead,
 which would be consistent with `term_exists()`: [source:tags/3.8.1/src/wp-
 includes/taxonomy.php#L1561].

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Ticket URL: <https://core.trac.wordpress.org/ticket/22746#comment:4>
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