Add a Sequence Protocol that does not match str
#15077
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This actually finds a bunch of cases we want to avoid in the Gnome module, which is proof that it works.
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This has exactly the behavior that you actually want, namely that a bare string does not match, but a sequence does. It's covariant, which is desirable in many cases to avoid needing to cast. It's also immutable, which is desirable in many cases.