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The pypi package dataclasses is designed as a backport for python 3.6. For python 3.7 and above, it is included in python itself. Thus, it isn't necessary for later python versions, and for windows 10 for example, this additional installation can confuse python. I'm currently experiencing an error related to that.
If we tweak requirements.txt to only install dataclasses for python 3.6 or lower, that issue for windows users goes away, and we have one less dependency, which is nice.
Edit: Another option is to just remove that line entirely, as it seems the latest PR has dropped this project's support for python 3.6?