wp-includes/sodium_compat/lib/php72compat.php:118$string1string$string2stringvoid function sodium_add( #[\SensitiveParameter] &$string1, #[\SensitiveParameter] $string2 ) { ParagonIE_Sodium_Compat::add($string1, $string2); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/sodium_compat/lib/php72compat.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.