Index: src/main/groovy/lang/MetaClassImpl.java
===================================================================
--- src/main/groovy/lang/MetaClassImpl.java	(revision 10297)
+++ src/main/groovy/lang/MetaClassImpl.java	(working copy)
@@ -762,8 +762,7 @@
 
         if (method == null && arguments.length == 1 && arguments[0] instanceof List) {
             Object[] newArguments = ((List) arguments[0]).toArray();
-            Class[] newArgClasses = MetaClassHelper.convertToTypeArray(newArguments);
-            method = getMethodWithCaching(sender, methodName, newArgClasses, isCallToSuper);
+            method = getMethodWithCaching(sender, methodName, newArguments, isCallToSuper);
             if (method != null) {
                 method = new TransformMetaMethod(method) {
                     public Object invoke(Object object, Object[] arguments) {