code: @Nonnull
  	public <V extends T> LToLongFunctionBuilder<T> aCase(Class<V> argC, LToLongFunction<V> function) {
  		PartialCaseWithLongProduct.The pc = partialCaseFactoryMethod(a -> (argC == null || argC.isInstance(a)));
  
  		pc.evaluate(function);
  		return self();
  	}
docs: Adds full new case for the argument that are of specific classes (matched by instanceOf, null is a wildcard).