Use strcasecmp over strtoupper #15
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See https://github.com/WordPress/wordpress-develop/pull/6387/files#r1618846517 and WordPress#5373 (comment).
There's reason to believe that
strcasecmp( $s[ $index ], $t[ $index ] )is more performant than string transformationsstrtoupper( $s[ $index ] ) === strtoupper( $t[ $index ] ). Let's use that.This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.