[wp-trac] [WordPress Trac] #43621: Introduce `add_action_once` and `add_filter_once` sugar.

[WordPress Trac]

#43621: Introduce `add_action_once` and `add_filter_once` sugar.
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 Reporter:  soulseekah       |       Owner:
     Type:  feature request  |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Plugins          |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by johnbillion):

 This is certainly a pattern that the test suite uses, and I could see a
 use for it. That said, is it a pattern that's used in non-test code often?

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Ticket URL: <https://core.trac.wordpress.org/ticket/43621#comment:2>
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