wp-includes/SimplePie/src/Source.php:124$keyoptional0 public function get_category($key = 0) { $categories = $this->get_categories(); if (isset($categories[$key])) { return $categories[$key]; } return null; }2 changes between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$key retyped from untyped to int.verified against sourcenone to SimplePie\Category|null.verified against sourcesrc/wp-includes/SimplePie/src/Source.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.