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You are right. When the NormalizedVersion class is used standalone, there is no project name to pass, so it is the responsibility of higher-level code (the Metadata class I think here) to raise or log messages including the project name.
To make a patch, you can use the hg.python.org/distutils2 repo (also mirrored on Bitbucket under the python_mirrors user account for easing cloning) or the CPython repository. Thanks!