wp-includes/rest-api.php:208Registers rewrite rules for the REST API.
function rest_api_init() { rest_api_register_rewrites(); global $wp; $wp->add_query_var( 'rest_route' );}Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.