add helper function for type error assertion

[sbidari]

closes #345

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (d8e9f5d) to head (24c1594).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #351   +/-   ##
=======================================
  Coverage   93.23%   93.24%           
=======================================
  Files          39       39           
  Lines         917      918    +1     
=======================================
+ Hits          855      856    +1     
  Misses         62       62           

Flag	Coverage Δ
unittests	93.24% <100.00%> (+<0.01%)	⬆️

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[damonbayer]

Looks nice. We need tests for this function. We should use it on every function for input validation. Maybe not appropriate to do that all in a single PR.

[sbidari]

Looks nice. We need tests for this function. We should use it on every function for input validation. Maybe not appropriate to do that all in a single PR.

Opened new issues for this!

[damonbayer]

@sbidari I should have been more clear. We should add the tests in this PR, but we can roll out input validation more gradually.

requests addressed