[mtfishman]

Summary

Comparing or hashing a named product looped over its names, which boxes each value of the mixed-type NamedTuple, so contractions over named sectors ran up to 2× slower than over positional ones. Products with the same names now compare their arguments directly, and hash is unrolled to give the same values.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.79%. Comparing base (a569fd4) to head (2b3711f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
- Coverage   85.79%   85.79%   -0.01%     
==========================================
  Files          40       40              
  Lines        2845     2844       -1     
==========================================
- Hits         2441     2440       -1     
  Misses        404      404              

Flag	Coverage Δ
docs	16.55% <33.33%> (-0.32%)	⬇️

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