Commits on Jul 31, 2022

1. prevent duplicate plugin discovery on misconfigured pythons …

   for example, `venv`-virtualenvs on fedora have both `lib` and `lib64` on
   `sys.path` despite them being the same.  this causes
   `importlib.metadata.distributions` to double-discover.
   
   ```console
   $ docker run --rm -t fedora:latest bash -c 'dnf install -qq -y python3 >& /dev/null && python3 -m venv venv && venv/bin/pip -qq install cfgv && venv/bin/python - <<< "from importlib.metadata import distributions; print(len([d for d in distributions() if d.name == '"'"'cfgv'"'"']))"'
   2
   ```

   

   asottile committed Jul 31, 2022
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