wp-includes/IXR/class-IXR-server.php:154$method function hasMethod($method) { return in_array($method, array_keys($this->callbacks)); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/IXR/class-IXR-server.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.