improve the type&conversion handling around IO

[exaexa]

should close #62

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6b261e9) to head (fc313b7).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #63   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           37        37           
  Lines          544       548    +4     
=========================================
+ Hits           544       548    +4     

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[stelmo]

looks good

[exaexa]

@stelmo does the save_converted_model name sound OK? maybe it should say save_model_converted_by_path_extension but man, naming is hard

🇩🇪 variant: speichern_mit_dateinamenerweiterungkonvertierung, wonderful how this can be managed in 3 simple words