Merge the Widgets Area Chooser feature plugin. First run, see #25821
Built from https://develop.svn.wordpress.org/trunk@26054


git-svn-id: http://core.svn.wordpress.org/trunk@25979 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Produce proper `CAST` for `DECIMAL` and `NUMERIC` in Meta Query. Adds a bunch of unit tests.

Props ericlewis.
Fixes #23033.


Built from https://develop.svn.wordpress.org/trunk@26055


git-svn-id: http://core.svn.wordpress.org/trunk@25980 1a063a9b-81f0-0310-95a4-ce76da25c4cd