fixup

Author: jazelly

lib/internal/webidl.js

@@ -281,7 +281,7 @@ function createDictionaryConverter(members) {
     opts = kEmptyObject,
   ) {
     const typeV = type(V);
-    if (V !== undefined && V !== null && typeV !== 'Object') {
+    if (V != null && typeV !== 'Object') {
       throw makeException(
         'can not be converted to a dictionary',
         opts,