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Lists were being over-validated when we added validation (see #920),
nox.options.sessions = ("a", "b")
should be allowed. I don't want to allownox.options.sessions = "ab"
, though, since that's surprising and would only work for one-letter sessions.I went with just validating both lists and tuples, though now that I think of it, maybe sets should be supported too. There's also the option of just validating for Sequence + not(str), but that can't be represented in static types (first commit), as far as I know. Edit: reverted to the original Sequence idea,set
andfrozenset
(at least) should be supported too.