wp-includes/sodium_compat/src/PHP52/SplFixedArray.php:94$indexstring|intbool public function offsetExists($index) { return array_key_exists((int) $index, $this->internalArray); }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/PHP52/SplFixedArray.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.