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Comment by xarope | Hacker News Reader

ah, ye olde two hard things, namely:

  1) cache invalidation
  2) naming things
  0) off-by-one

with apologies to Leon, I think I first saw it from Martin (he gives full credit to the sources), so I'll post to link here for completeness:

Note that link credits Leon. (I’d swear I heard this variation much earlier, but maybe I’m totally wrong.)

That's the title link, too.

I like telling it as 3 hard things: caches and naming things.