Loader: enable pickling

[mr-c]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.31%. Comparing base (7b0addb) to head (ce2b0fd).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #924      +/-   ##
==========================================
+ Coverage   83.30%   83.31%   +0.01%     
==========================================
  Files          22       22              
  Lines        4948     4952       +4     
  Branches     1185     1185              
==========================================
+ Hits         4122     4126       +4     
  Misses        548      548              
  Partials      278      278              

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