[wp-trac] [WordPress Trac] #39706: Add $unique param to add_{$meta_type}_meta actions

[WordPress Trac]

#39706: Add $unique param to add_{$meta_type}_meta actions
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 Reporter:  barryceelen         |      Owner:
     Type:  enhancement         |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Options, Meta APIs  |    Version:
 Severity:  normal              |   Keywords:
  Focuses:                      |
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 The hooks `add_{$meta_type}_meta` and similar provide context about
 `$object_id`, `$meta_key`, `$_meta_value` and such, but do not tell
 whether the meta data added or updated is supposed to be `$unique`.

 Adding this information could be helpful. My use case for instance is
 propagating meta data across posts.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39706>
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