wp-includes/SimplePie/src/Parser.php:230int public function get_error_code() { return $this->error_code; }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
none to int.verified against sourcesrc/wp-includes/SimplePie/src/Parser.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.