wp-includes/sodium_compat/src/Core/BLAKE2b.php:213$xSplFixedArrayint protected static function flatten64($x) { return (int) ($x[0] * 4294967296 + $x[1]); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/sodium_compat/src/Core/BLAKE2b.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.