Bump PolyType and simplify Unity instructions

[AArnott]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.49%. Comparing base (5a1a6c1) to head (834f48e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   84.50%   84.49%   -0.01%     
==========================================
  Files         167      167              
  Lines       13704    13704              
  Branches     1459     1459              
==========================================
- Hits        11580    11579       -1     
- Misses       2096     2097       +1     
  Partials       28       28              

Flag	Coverage Δ
Linux	82.90% <ø> (ø)
Windows	84.45% <ø> (-0.03%)	⬇️

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