[issue30599] os.register_at_fork(): allow to unregister callbacks -- test_threaded_import leaks references

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This make the API and implementation more complex. I prefer making tests not creating several instances of the random module. Or do this in a short-living subprocess.

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nosy: +rhettinger

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<http://bugs.python.org/issue30599>
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