Use axes function instead of field access

[jishnub]

When the axes for an abstract type are fetched, it's best to use axes(A) instead of A.axes to avoid assuming that there is a field with that name in every subtype.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6c3d030) 95.25% compared to head (edd3556) 99.88%.
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #320      +/-   ##
==========================================
+ Coverage   95.25%   99.88%   +4.63%     
==========================================
  Files           8        8              
  Lines         906      908       +2     
==========================================
+ Hits          863      907      +44     
+ Misses         43        1      -42     

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