Automatically set 'compare' => 'IN' in WP_Meta_Query::get_sql() when the meta...
Automatically set 'compare' => 'IN' in WP_Meta_Query::get_sql() when the meta value is an array. Props ldebrouwer, SergeyBiryukov. Fixes #16829. git-svn-id: https://core.svn.wordpress.org/trunk@18825 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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