[issue1145] Allow str.join to join non-string types (as per PEP 3100)

[Guido van Rossum]

Guido van Rossum added the comment:

> Should it really, even if the bytes is ascii-encodable?

Yes, really.  We don't want to open up the same can of worms that made
working with Unicode such a pain in 2.x.

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