[issue29262] Provide a way to check for *real* typing.Union instances

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

> Maybe a proposal should be discussed as an addendum to PEP 484? Or would
Mark Shannon reject that?

On one hand, I would like to involve a wider audience to this discussion. On the other hand, an addition to the PEP could slow things down. Maybe a discussion on python-dev followed by implementation plus extensive docs would work?

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<http://bugs.python.org/issue29262>
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