Incorrect array type created when calling vararg method

I have a constructor:

Foo( String foo, long bar, double... values )

in groovy, i am calling it with a String, a Long, and an Integer.

ParameterTypes.fitToVarArgs correctly determines that the array is a Double.

however, when MetaClassHelper.makeArray is called, it does:

        Class baseClass = secondary;
        if (obj != null) {
            baseClass = obj.getClass();
        }

which overrides the Double.class that is secondary, with Integer.class from the incoming value.

The constructor invocation then fails since the correct type was not passed.