fix: resolve TypeError on import for Python < 3.9.2

[bdraco]

#150 shows we have a problem with Python < 3.9.2

This is because of a bug in cpython that was not fixed until 3.9.2 python/cpython#87131

fixes #150

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b23d919) to head (dc297f8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #151   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          250       249    -1     
  Branches        53        53           
=========================================
- Hits           250       249    -1     

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