Don't assume object hashes are unique in caching logic

[brentyi]

Fixes #214

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.82%. Comparing base (735530a) to head (ae94fbf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #215   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files          28       28           
  Lines        2296     2303    +7     
=======================================
+ Hits         2292     2299    +7     
  Misses          4        4           

Flag	Coverage Δ
unittests	99.82% <100.00%> (+<0.01%)	⬆️

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