warn about non-idempotency

[xaltsc]

fixes #131

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.40%. Comparing base (3f49885) to head (7a8e3bf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #132   +/-   ##
=======================================
  Coverage   62.40%   62.40%           
=======================================
  Files           6        6           
  Lines         508      508           
=======================================
  Hits          317      317           
  Misses        191      191           

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[michaeladler]

Thanks!