Switch to operator for adding references

[nicbell]

Summary

Switch to operator for adding references

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.85%. Comparing base (06331eb) to head (05c86b6).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   93.54%   92.85%   -0.70%     
==========================================
  Files           2        2              
  Lines          93       84       -9     
  Branches       14       14              
==========================================
- Hits           87       78       -9     
  Misses          3        3              
  Partials        3        3              

Flag	Coverage Δ
unittests	92.85% <100.00%> (-0.70%)	⬇️

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