add equality operator to supported operators

[palday]

closes #512

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.52%. Comparing base (5677359) to head (a86875f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #538   +/-   ##
=======================================
  Coverage   85.51%   85.52%           
=======================================
  Files          26       26           
  Lines        1712     1713    +1     
=======================================
+ Hits         1464     1465    +1     
  Misses        248      248           

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[frankier]

LGTM -- probably a breaking change though so should go in 0.15?