[wp-trac] [WordPress Trac] #55105: Introduce a polyfill for `array_is_list()`.

[WordPress Trac]

#55105: Introduce a polyfill for `array_is_list()`.
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 Reporter:  costdev                   |       Owner:  (none)
     Type:  feature request           |      Status:  new
 Priority:  normal                    |   Milestone:  6.0
Component:  General                   |     Version:  5.9
 Severity:  minor                     |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by costdev):

 PR ready for review.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55105#comment:3>
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