Support FixedSizeArrays

[jakobnissen]

TODO:

• FixedSizeArrays should be registered and versioned before I will support it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.88%. Comparing base (0a56a55) to head (d73d490).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   96.83%   96.88%   +0.04%     
==========================================
  Files           5        6       +1     
  Lines         253      257       +4     
==========================================
+ Hits          245      249       +4     
  Misses          8        8              

Flag	Coverage Δ
unittests	96.88% <100.00%> (+0.04%)	⬆️

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