Allow ufunc_mode="python-calculate" for all fields

[mhostetter]

Fixes #540

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.57%. Comparing base (9afd83d) to head (430bf98).
Report is 14 commits behind head on release/0.3.x.

❗ Current head 430bf98 differs from pull request most recent head 9c6d864

Please upload reports for the commit 9c6d864 to get more accurate results.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.3.x     #551      +/-   ##
=================================================
+ Coverage          96.44%   96.57%   +0.12%     
=================================================
  Files                 46       46              
  Lines               5911     5895      -16     
=================================================
- Hits                5701     5693       -8     
+ Misses               210      202       -8     

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