Sure, in practice, no one ever builds the whole list of tokens in memory, because they all use the same sort of idea described in the article (and described aga

Sure, in practice, no one ever builds the whole list of tokens in memory, because they all use the same sort of idea described in the article (and described again in your comment). But the article author chose to compare why they don't ever do it that way, and that's what I was commenting on.