[issue29514] Add a test case that prevents magic number changes in minor releases

[Nick Coghlan]

Nick Coghlan added the comment:

This has now been backported to all active maintenance branches.

For 2.7, I backported the test as a standalone one in Lib/test/test_import_magic.py, since there's only a partial importlib implementation in 2.7, and hence no test_importlib directory.

Thanks all!

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resolution:  -> fixed
stage: backport needed -> resolved
status: open -> closed

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