[wp-trac] [WordPress Trac] #56288: Add mime output control to `add_image_size`

[WordPress Trac]

#56288: Add mime output control to `add_image_size`
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 Reporter:  adamsilverstein                        |       Owner:  (none)
     Type:  enhancement                            |      Status:  new
 Priority:  normal                                 |   Milestone:  6.1
Component:  Media                                  |     Version:
 Severity:  normal                                 |  Resolution:
 Keywords:  dev-feedback has-patch has-unit-tests  |     Focuses:
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Changes (by adamsilverstein):

 * Attachment "56288.2.diff" added.

 update from PR

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Ticket URL: <https://core.trac.wordpress.org/ticket/56288>
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