desrosj 02a98204d7 Grouped backports to the 4.8 branch.
- Query: Improve sanitization within `WP_Tax_Query`.
- Query: Improve sanitization within `WP_Meta_Query`.
- Upgrade/Install: Avoid using `unserialize()` unnecessarily.
- Formatting: Correctly encode ASCII characters in post slugs.

Merges [52454-52457] to the 4.8 branch.
Props vortfu, dd32, ehtis, zieladam, whyisjake, xknown, peterwilsoncc, desrosj, iandunn.
Built from https://develop.svn.wordpress.org/branches/4.8@52475


git-svn-id: http://core.svn.wordpress.org/branches/4.8@52067 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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