Eager updates, and loss refactor

[murrellb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 20 lines in your changes missing coverage. Please review.

Project coverage is 54.23%. Comparing base (c199388) to head (a6a7bbd).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/model.jl	28.57%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   57.42%   54.23%   -3.20%     
==========================================
  Files           6        6              
  Lines         350      378      +28     
==========================================
+ Hits          201      205       +4     
- Misses        149      173      +24     

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