[wp-trac] [WordPress Trac] #35066: Rename `.maintenance` for compatibility

[WordPress Trac]

#35066: Rename `.maintenance` for compatibility
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 Reporter:  dd32                   |       Owner:
     Type:  defect (bug)           |      Status:  new
 Priority:  normal                 |   Milestone:  Future Release
Component:  Upgrade/Install        |     Version:
 Severity:  normal                 |  Resolution:
 Keywords:  2nd-opinion has-patch  |     Focuses:
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Comment (by dd32):

 Tempted to mark this as `wonftix`. I no longer really see it worthwhile to
 switch with reports of this being so few and far between.

 Alternate options would be to use `file_exists()` directly and perform a
 FTP `DELETE` operation regardless of if we can see it via FTP.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35066#comment:7>
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