docs: @Nonnull
  	public <V extends T> LToIntFunctionBuilder<T> aCase(Class<V> argC, LToIntFunction<V> function) {
  		PartialCaseWithIntProduct.The pc = partialCaseFactoryMethod(a -> (argC == null || argC.isInstance(a)));
  
  		pc.evaluate(function);
  		return self();
  	}