There is an infinite loop occurring in TypeHelper.normalize(). The issue seems to occur any time a parameterized supertype is passed into TypeHelper.isAssignable.

I was able to see that in my test cases, ParameterizedType.getActualTypeArguments() is returning the same exact object as Class.getTypeParameters()... which causes TypeHelper to create a map with an entry where Key = Value. Given the logic in TypeHelper.normalize(), this in turn causes an infinite loop.

	private static <K, V> Map<K, V> normalize(Map<K, V> map) {
		// TODO: will this cause an infinite loop with recursive bounds?

		for ( Entry<K, V> entry : map.entrySet() ) {
			K key = entry.getKey();
			V value = entry.getValue();

			while ( map.containsKey( value ) ) {
				value = map.get( value );
			}

			map.put( key, value );
		}

		return map;
	}

I've attached a couple of test cases. Which illustrate the issue.