debug: NonLinModel fields are now all concrete types

[franckgaga]

Not proud of this but I forgot to remove a struct parameter in SimModelBuffer in last release. As a result, the buffer field in NonLinModel was an abstract type, instead of a fully defined concrete type, as it should be.

Yep similar mistake as before! 😢

I need to find the time to implement some JET.jl tests for type stability and such.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.01%. Comparing base (2b1abf0) to head (06c65e0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
+ Coverage   98.57%   99.01%   +0.44%     
==========================================
  Files          24       24              
  Lines        3787     3770      -17     
==========================================
  Hits         3733     3733              
+ Misses         54       37      -17     

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