Allow units to be defined by bytes

[davidhassell]

Fixes #54

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fac74a5) 81.15% compared to head (6bc2bd0) 81.25%.

❗ Current head 6bc2bd0 differs from pull request most recent head 0d0cf7f. Consider uploading reports for the commit 0d0cf7f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   81.15%   81.25%   +0.11%     
==========================================
  Files           2        2              
  Lines         684      688       +4     
==========================================
+ Hits          555      559       +4     
  Misses        129      129              

Flag	Coverage Δ
unittests	81.25% <100.00%> (+0.11%)	⬆️

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[sadielbartholomew]

Makes the fix and +1 for adding a test to cover this in case of a similar bug in future. All good, please merge.

(During reviewing I noticed some unrelated doctest failures, on main as well as this branch, for our test suite, so I'm looking into those and will put up a PR to fix them if they are legit.)