wp-includes/abilities-api/class-wp-ability-category.php:159Retrieves the slug of the ability category.
string public function get_slug(): string { return $this->slug; }Introduced in 6.9.0. Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/abilities-api/class-wp-ability-category.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.