Always pass integer expirations to cache backends.

props SergeyBiryukov, andreasnrb.
fixes #25308.


git-svn-id: https://develop.svn.wordpress.org/trunk@25451 602fd350-edb4-49c9-b593-d223f7449a82
Use get_terms() in the ajax tag search.

props Chouby.
fixes #25231.


git-svn-id: https://develop.svn.wordpress.org/trunk@25452 602fd350-edb4-49c9-b593-d223f7449a82