wp-includes/class-wp-text-diff-renderer-table.php:534$aint$bintint public function difference( $a, $b ) { return abs( $a - $b ); }Introduced in 2.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-text-diff-renderer-table.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.