[wp-trac] [WordPress Trac] #40012: Only add_metadata if no matching value

[WordPress Trac]

#40012: Only add_metadata if no matching value
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 Reporter:  johnjamesjacoby     |       Owner:
     Type:  defect (bug)        |      Status:  new
 Priority:  normal              |   Milestone:  Awaiting Review
Component:  Options, Meta APIs  |     Version:  2.9
 Severity:  normal              |  Resolution:
 Keywords:  2nd-opinion         |     Focuses:
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Comment (by johnjamesjacoby):

 Thinking about this more, there could be 4 types of uniqueness:

 * Unique `meta_key` to all objects
 * Unique `meta_key` to the `$object_id` (what `$unique` currently checks)
 * Unique `meta_key` and `meta_value` to all objects
 * Unique `meta_key` and `meta_value` the `$object_id` (what my patch adds)

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Ticket URL: <https://core.trac.wordpress.org/ticket/40012#comment:1>
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