[wp-trac] [WordPress Trac] #39042: REST API: Allow sanitization_callback to be set to null to bypass `rest_parse_request_arg()`

[WordPress Trac]

#39042: REST API: Allow sanitization_callback to be set to null to bypass
`rest_parse_request_arg()`
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 Reporter:  rachelbaker               |       Owner:  kkoppenhaver
     Type:  defect (bug)              |      Status:  assigned
 Priority:  normal                    |   Milestone:  4.7.1
Component:  REST API                  |     Version:  trunk
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by joehoyle):

 This looks good to me, I had incorrectly assumed `isset` was going to fail
 on `null`, but I guess that's not the case.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39042#comment:9>
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