PR18517 has, likely, a utf-8 dependency. AIX, default latin-1 does not accept the new test.

Starting with this merge AIX bot fails with:
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ERROR: test_name_resolution (test.test_pkgutil.PkgutilTests)
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Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_pkgutil.py", line 249, in test_name_resolution
    os.makedirs(d, exist_ok=True)
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/os.py", line 223, in makedirs
    mkdir(name, mode)
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 17-19: ordinal not in range(256)

Not completely resolved.