Box reform

[simonask]

Closes #74

[codecov]

Codecov Report

Attention: Patch coverage is 95.31250% with 24 lines in your changes missing coverage. Please review.

Project coverage is 98.98%. Comparing base (6b4281b) to head (85a059c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/box.rs	95.31%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   99.31%   98.98%   -0.33%     
==========================================
  Files          22       22              
  Lines        5946     6379     +433     
==========================================
+ Hits         5905     6314     +409     
- Misses         41       65      +24     

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[simonask]

(I'm taking the coverage hit - I'm exhausted and have stuff to do.)