[issue15373] copy.copy() does not properly copy os.environment

[Andrei Kulakov]

Andrei Kulakov <andrei.avk at gmail.com> added the comment:

I think it may be good to deprecate and discourage use of `os.environ.copy()`, and add a new method `os.environ.asdict()`. And possibly have `__copy__` raise an error pointing users to `os.environ.asdict()`.

I'm not sure what to do about pickling.

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nosy: +andrei.avk

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<https://bugs.python.org/issue15373>
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