Boone Gorges c0a0d4ba50 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.
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git-svn-id: http://core.svn.wordpress.org/trunk@34058 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2015-09-12 21:06:24 +00:00

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