make the dw r optimizeable

[kmdalton]

Branch to explore whether optimizing the DW r-value is pathological.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.16%. Comparing base (46ffb65) to head (889db14).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
- Coverage   83.47%   83.16%   -0.31%     
==========================================
  Files          53       53              
  Lines        2499     2572      +73     
==========================================
+ Hits         2086     2139      +53     
- Misses        413      433      +20     

Flag	Coverage Δ
unittests	83.16% <100.00%> (-0.31%)	⬇️

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