docs: @Nonnull
  	public <V extends T> LObjIntLongFunctionBuilder<T, R> aCase(Class<V> argC1, LObjIntLongFunction<V, R> function) {
  		PartialCaseWithProduct.The pc = partialCaseFactoryMethod((a1, a2, a3) -> (argC1 == null || argC1.isInstance(a1)));
  
  		pc.evaluate(function);
  		return self();
  	}