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That are three changes. Every arrow is one.

Classic fence post error.

And technically 2 new CEOs

The three hard problems: naming things and off-by-one errors

I always heard:

There are two hard problems: naming things, cache invalidation, and off-by-one errors.

1 hard problems.

naming things, cache invalidation, off-by one errors, and overflows.

Thank you for not editing this away. Easy mistake to make, and gave us a good laugh (hopefully laughing with you. Everyone who's ever programmed has made the same error).

Set semantic or List semantic?

Edit: Making no excuses, this one is embarrassing.