[wp-trac] [WordPress Trac] #51278: Update return types to reflect the real return types. Remove mixed.

[WordPress Trac]

#51278: Update return types to reflect the real return types. Remove mixed.
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 Reporter:  ReneHermi               |       Owner:  (none)
     Type:  enhancement             |      Status:  reviewing
 Priority:  normal                  |   Milestone:  Future Release
Component:  General                 |     Version:
 Severity:  major                   |  Resolution:
 Keywords:  has-patch dev-feedback  |     Focuses:  docs, coding-standards
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Comment (by ReneHermi):

 @azaozz Very well! This is clear and very comprehensible. Will save
 thousands of man-hours. Looking forward to see this merged.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51278#comment:27>
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