WordPress/wp-includes
Gary Pendergast e8617fb3a5 Database: Restore numbered placeholders in wpdb::prepare().
[41496] removed support for numbered placeholders in queries send through `wpdb::prepare()`, which, despite being undocumented, were quite commonly used.

This change restores support for numbered placeholders (as well as a subset of placeholder formatting), while also adding extra checks to ensure the correct number of arguments are being passed to `wpdb::prepare()`, given the number of placeholders.

Merges [41662], [42056] to the 4.6 branch.
See #41925.


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git-svn-id: http://core.svn.wordpress.org/branches/4.6@41888 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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