diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/block-supports/utils.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/block-supports/utils.php	Tue Sep 27 16:37:53 2022 +0200
@@ -0,0 +1,36 @@
+<?php
+/**
+ * Block support utility functions.
+ *
+ * @package WordPress
+ * @subpackage Block Supports
+ * @since 6.0.0
+ */
+
+/**
+ * Checks whether serialization of the current block's supported properties
+ * should occur.
+ *
+ * @since 6.0.0
+ * @access private
+ *
+ * @param WP_Block_Type $block_type  Block type.
+ * @param string        $feature_set Name of block support feature set..
+ * @param string        $feature     Optional name of individual feature to check.
+ *
+ * @return boolean Whether to serialize block support styles & classes.
+ */
+function wp_should_skip_block_supports_serialization( $block_type, $feature_set, $feature = null ) {
+	if ( ! is_object( $block_type ) || ! $feature_set ) {
+		return false;
+	}
+
+	$path               = array( $feature_set, '__experimentalSkipSerialization' );
+	$skip_serialization = _wp_array_get( $block_type->supports, $path, false );
+
+	if ( is_array( $skip_serialization ) ) {
+		return in_array( $feature, $skip_serialization, true );
+	}
+
+	return $skip_serialization;
+}