protected AbstractDiagnostic createTypeDiagnostic(XExpression expression, LightweightTypeReference actualType, LightweightTypeReference expectedType) {
	if (!expectedType.isAny()) {
		String actualName = actualType.getSimpleName();
		String expectedName = expectedType.getSimpleName();
		if (actualName.equals(expectedName)) {
			// MdB: this is where it all goes wrong.. sometimes similar JvmTypes are not 're-assignable' ?
			if (expectedType.isAssignableFrom(actualType)) {
				return null;
			// MdB: dirty fix: consider types with the same identifier (FQN) to be compatible..
			} else if (actualType.getIdentifier() != null && actualType.getIdentifier().equals(expectedType.getIdentifier())) {
				return null;
			}
		}
	...
}