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

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

OK, I will make a PR to typing adding a folder (as it is done for mypy_extensions) with a basic set of runtime type inspection functions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29262>
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