Remove unnecessary preserve calls

[helgee]

Fix #15

[codecov]

Codecov Report

Merging #16 (ee92451) into main (c40bc1b) will not change coverage.
The diff coverage is 94.73%.

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   99.18%   99.18%           
=======================================
  Files          27       27           
  Lines        3055     3055           
=======================================
  Hits         3030     3030           
  Misses         25       25           

Impacted Files	Coverage Δ
src/g.jl	96.83% <92.30%> (ø)
src/cells.jl	91.93% <100.00%> (ø)
src/t.jl	100.00% <100.00%> (ø)
src/u.jl	100.00% <100.00%> (ø)

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