Gary Pendergast a09ea91d16 Database: Use the utf8mb4_unicode_520_ci collation, when available.
The `utf8mb4_unicode_520_ci` (Unicode Collation Algorithm 5.2.0, October 2010) collation is an improvement over `utf8mb4_unicode_ci` (UCA 4.0.0, November 2003).

There is no word on when MySQL will support later UCAs.

Fixes #32105.



git-svn-id: https://develop.svn.wordpress.org/trunk@37523 602fd350-edb4-49c9-b593-d223f7449a82
2016-05-23 06:31:44 +00:00
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