[Python-Dev] Adding NewType() to PEP 484

[Ivan Levkivskyi]

Hi,

It has been proposed to enhance the typing module with a NewType function
that allows to define simple unique types with almost zero runtime overhead.

The PR containing actual implementation and PEP 484 update is here:
https://github.com/python/typing/pull/226

Review comments are very welcome.

Best regards,
Ivan
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