Reduce Unknown types at API boundaries

[brentyi]

Fixes #243

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (984c009) to head (029c411).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   99.78%   99.78%   -0.01%     
==========================================
  Files          28       28              
  Lines        2327     2326       -1     
==========================================
- Hits         2322     2321       -1     
  Misses          5        5              

Flag	Coverage Δ
unittests	99.78% <ø> (-0.01%)	⬇️

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