[wp-trac] [WordPress Trac] #51379: Add filter to function email_exists()

[WordPress Trac]

#51379: Add filter to function email_exists()
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 Reporter:  apermo                           |       Owner:  SergeyBiryukov
     Type:  feature request                  |      Status:  reviewing
 Priority:  normal                           |   Milestone:  5.6
Component:  Users                            |     Version:
 Severity:  normal                           |  Resolution:
 Keywords:  has-patch needs-dev-note commit  |     Focuses:
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Changes (by garrett-eclipse):

 * Attachment "51379.4.diff" added.

 One further minor docblock update remove `or not` as when refering to
 `exists` and `valid` the `or not` is already inferred.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51379>
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