Andrew Nacin 4f5608f653 Use a float for last_changed microtime cache values.
microtime() by default returns a string with a space, which isn't allowed for keys in some cache backends.

props _jameslee, drozdz.
fixes #27000. see #23448.


git-svn-id: https://develop.svn.wordpress.org/trunk@27115 602fd350-edb4-49c9-b593-d223f7449a82
2014-02-07 08:13:37 +00:00
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