wp-includes/sodium_compat/lib/php72compat.php:885$key_pairstringstring function sodium_crypto_kx_secretkey( #[\SensitiveParameter] $key_pair ) { return ParagonIE_Sodium_Compat::crypto_kx_secretkey($key_pair); }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.