Boone Gorges 4fdfdb6078 Use stricter sanitization for meta query clause keys.
By forcing all clause keys to be strings, we make it possible to use strict
comparison when validating values of 'orderby' as passed to `WP_Query`. This
eliminates situations where the presence of numeric clause keys could result
in an improperly validated 'orderby' value.

Props nikolov.tmw.
Fixes #32937.

git-svn-id: https://develop.svn.wordpress.org/trunk@34090 602fd350-edb4-49c9-b593-d223f7449a82
2015-09-12 21:05:14 +00:00
2015-03-13 18:11:33 +00:00
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