[wp-trac] [WordPress Trac] #34659: Whitelist for validation functions which only accept one argument

[WordPress Trac]

#34659: Whitelist for validation functions which only accept one argument
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 Reporter:  danielbachhuber  |       Owner:  rmccue
     Type:  enhancement      |      Status:  assigned
 Priority:  normal           |   Milestone:  Future Release
Component:  REST API         |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |     Focuses:
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Comment (by brianhogg):

 After discussing with @rachelbaker added a `validate_callback_single_arg`
 and `sanitize_callback_single_arg`.  When set to `true` will only pass the
 value and nothing else to the callback function.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34659#comment:23>
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