wp-includes/class-wp-theme-json-resolver.php:449When given an array, this will remove any keys with the name //.
$input_arrayarrayarray private static function remove_json_comments( $input_array ) { unset( $input_array['//'] ); foreach ( $input_array as $k => $v ) { if ( is_array( $v ) ) { $input_array[ $k ] = static::remove_json_comments( $v ); } } return $input_array; }Introduced in 6.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-theme-json-resolver.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.