Add bypass mechanism for doing it wrong

Author: sirreal

src/wp-includes/class-wp-dependencies.php

@@ -289,7 +289,7 @@ public function add_data( $handle, $key, $value ) {
 		if ( ! isset( $this->registered[ $handle ] ) ) {
 			return false;
 		}
-		if ( 'conditional' === $key ) {
+		if ( 'conditional' === $key && '_required-conditional-dependency_' !== $value ) {
 			_deprecated_argument(
 				'WP_Dependencies->add_data()',
 				'6.9.0',

src/wp-includes/script-loader.php

@@ -1054,6 +1054,7 @@ function wp_default_scripts( $scripts ) {
 
 	// Not used in core, obsolete. Registered for backward compatibility.
 	$scripts->add( 'json2', "/wp-includes/js/json2$suffix.js", array(), '2015-05-03' );
+	did_action( 'init' ) && $scripts->add_data( 'json2', 'conditional', '_required-conditional-dependency_' );
 
 	$scripts->add( 'underscore', "/wp-includes/js/underscore$dev_suffix.js", array(), '1.13.7', 1 );
 	$scripts->add( 'backbone', "/wp-includes/js/backbone$dev_suffix.js", array( 'underscore', 'jquery' ), '1.6.0', 1 );