00c39a3f98
`WP_Query` discards most non-array date values ('year', 'monthnum', etc) by
casting to integer. Since [25138], the 'm' parameter has been handled
as a string; see #24884. However, the string-handling introduced in [25138]
blindly attempted to handle arrays and other non-scalar types as strings,
resulting in PHP notices and invalid MySQL syntax.
Props vortfu.
Fixes #36718.
git-svn-id: https://develop.svn.wordpress.org/trunk@37324 602fd350-edb4-49c9-b593-d223f7449a82