Tim Peters writes:

 > Every suggestion here so far has satisfied that, if S is a non-empty set,
 > 
 >     assert next(iter(S)) is first(S)
 > 
 > succeeds.  That is, `first()` is _defined_ by reference to iteration
 > order.  It's "the first" in that order (hence the name).

The problem I'm concerned with is that sometimes users' definitions of
words differ from a computer language's definitions of words.  That's
why I used the word "natural", which doesn't really have much to do
with the way a computer language defines things, but frequently
features in human thought.

Whether that potential difference matters here is an empirical
question.  Theoretically, I can say "Explicit is better than implicit."
I.e., the call to 'iter' tells us exactly what order is being used.
That's *my* opinion in this case, and I don't hold *you* to it just
because I'm quoting you.  (I am amused, though.)

Steve

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