Preserve the cells

[helgee]

Thanks for your help @vtjnash!

[codecov]

Codecov Report

Merging #17 (a905fb1) into main (eb6d540) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   99.18%   99.22%   +0.04%     
==========================================
  Files          27       27              
  Lines        3055     3215     +160     
==========================================
+ Hits         3030     3190     +160     
  Misses         25       25              

Impacted Files	Coverage Δ
src/b.jl	100.00% <100.00%> (ø)
src/c.jl	100.00% <100.00%> (ø)
src/cells.jl	92.30% <100.00%> (+0.37%)	⬆️
src/d.jl	98.37% <100.00%> (+0.03%)	⬆️
src/g.jl	97.35% <100.00%> (+0.52%)	⬆️
src/i.jl	100.00% <100.00%> (ø)
src/k.jl	100.00% <100.00%> (ø)
src/l.jl	100.00% <100.00%> (ø)
src/o.jl	100.00% <100.00%> (ø)
src/p.jl	100.00% <100.00%> (ø)
... and 5 more

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