added tests to check pep604 union types in typed collections

[tclose]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.21%. Comparing base (85fc309) to head (a3b428a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   92.21%   92.21%           
=======================================
  Files          47       47           
  Lines        5307     5307           
  Branches      608      608           
=======================================
  Hits         4894     4894           
  Misses        304      304           
  Partials      109      109           

Flag	Coverage Δ
	92.16% <ø> (ø)

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