[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:  5.7
Component:  General      |     Version:
 Severity:  normal       |  Resolution:
 Keywords:  has-patch    |     Focuses:  docs, coding-standards
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Comment (by SergeyBiryukov):

 Related: [47397] / #48303.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51278#comment:16>
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