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[NOTE: In this comment, I use BB to mean unicode character 0x1D539, b/c the issue tracker won't let me submit a comment with unicode characters in it.]
Directory structure:
repro/
 foo.py
 test_foo.py
Contents of foo.py:
 BB = 1
 __all__ = ['BB']
Contents of test_foo.py:
 from .foo import *
Error message:
 AttributeError: module 'repro.foo' has no attribute 'BB'
If I change foo.py to have `__all__ = ['B']` (note that 'B' is not the same as 'BB'), then everything works "fine", modulo the fact that now foo.B is a thing and foo.BB is not a thing.
[Recall that in the above, BB is a placeholder for U+1D539, which the issuetracker prevents me from writing here.]