I think this bit is a piece of wisdom: "I’m a firm believer that we should understand how things work underneath the hood so that we can make the most effectiv

I think this bit is a piece of wisdom: "I’m a firm believer that we should understand how things work underneath the hood so that we can make the most effective use of at them. No program should rely on the particulars of the iterator object internals for correctness, but a well-written program should employ them in a way that best exploits their expected implementation."