[GradedAxes] Fix iterate

[mtfishman]

Fixes #1416.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.26%. Comparing base (e08e131) to head (7d08f0e).
Report is 1 commits behind head on main.

❗ Current head 7d08f0e differs from pull request most recent head 72879f2

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Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1468       +/-   ##
===========================================
+ Coverage   43.65%   79.26%   +35.61%     
===========================================
  Files         136      148       +12     
  Lines        8806     9679      +873     
===========================================
+ Hits         3844     7672     +3828     
+ Misses       4962     2007     -2955     

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