Make Junction.Str return...a Str!
Make Junction.Str return...a Str!

Previously, it would form a Junction with everything Str'd. Thing is,
things that (fairly) expect to get back a Str when they call .Str will
then explode when they try to unbox it. This brings us in line with
Niecza's semantics, so at the very least it's convergence...

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