847e46abc9
In the transition functions, we don't really need to recheck this after the first call. I had been feeling paranoid about possibly getting a non-null argument value in some other context; but it's probably game over anyway if we have a non-null "internal" value that's not what we are expecting. In the final functions, the general convention in pre-existing final functions seems to be that an Assert() is good enough, so do it like that here too. This seems to save a few tenths of a percent of overall query runtime, which isn't much, but still it's just overhead if there's not a plausible case where the checks would fire.
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