add sort/2

[ichiban]

#144

[codecov-commenter]

Codecov Report

Merging #153 (7f401a4) into main (8316775) will decrease coverage by 0.03%.
The diff coverage is 95.12%.

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
- Coverage   93.83%   93.80%   -0.04%     
==========================================
  Files          18       18              
  Lines        5257     5262       +5     
==========================================
+ Hits         4933     4936       +3     
- Misses        274      275       +1     
- Partials       50       51       +1     

Impacted Files	Coverage Δ
engine/builtin.go	91.11% <89.47%> (-0.02%)	⬇️
engine/compound.go	100.00% <100.00%> (ø)
engine/float.go	94.44% <100.00%> (+0.15%)	⬆️
engine/integer.go	100.00% <100.00%> (ø)
interpreter.go	92.30% <100.00%> (+0.03%)	⬆️

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