[wp-trac] [WordPress Trac] #43583: Introduce new PHP cross-version compat function `is_countable()`

[WordPress Trac]

#43583: Introduce new PHP cross-version compat function `is_countable()`
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 Reporter:  jrf                           |       Owner:
     Type:  enhancement                   |      Status:  new
 Priority:  normal                        |   Milestone:  4.9.6
Component:  General                       |     Version:
 Severity:  normal                        |  Resolution:
 Keywords:  needs-patch needs-unit-tests  |     Focuses:
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Comment (by jrf):

 If nobody picks this up in the mean time, I'll try and get a patch + unit
 tests sorted at the WC Rotterdam contributors day this Friday.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43583#comment:3>
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