Fix Numpy pickle warnings

[j-c-c]

Resolves #1333

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.65%. Comparing base (8577e1d) to head (42c6aaf).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1334   +/-   ##
========================================
  Coverage    90.65%   90.65%           
========================================
  Files          133      133           
  Lines        14433    14433           
========================================
  Hits         13084    13084           
  Misses        1349     1349           

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[garrettwrong]

Looks good, lets check the minimal numpy version we require can open the new files. If not we may need to reconsider.

Also, do you know why they are different sizes?

[j-c-c]

Looks good, lets check the minimal numpy version we require can open the new files. If not we may need to reconsider.

The minimal numpy version could not open the new files. Updated to using the npz format and confirmed that the minimal numpy version can load the files. This involved a small refactor of the tests to handle the npz dicts.

Also, do you know why they are different sizes?

These were very small files, so a fair amount of the size was in overhead, ie. header and pickle protocol, which changed when saving with the new numpy version.

[garrettwrong]

Awesome, much better approach, thanks

[garrettwrong]

You can probably bypass Joakim on this one once all the CI clears. 🚀