[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:  4.5
Component:  Upgrade/Install          |     Version:
 Severity:  normal                   |  Resolution:
 Keywords:  needs-patch 2nd-opinion  |     Focuses:
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Comment (by chacha102):

 Because of how often the check is ran, and because the file system doesn't
 cache false responses to file_exists, I definitely agree we should move to
 get rid of the backwards compatibility as soon as possible. Fortunately,
 for the majority of requests I only had to add one file_exists check.

 I played around with a structure to store which of the file_exists checks
 came out true so that including the file didn't require an additional
 (albeit duplicate) check, but I felt that would ad to much overhead to the
 first set of checks that are much more commonly ran.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35066#comment:3>
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