refine Term

[ichiban]

#238

Refine interface Term, especially *Compound, so that we can introduce efficient representation of lists, strings, etc.

[codecov]

Codecov Report

Merging #249 (8ba639e) into main (aa576b8) will increase coverage by 0.17%.
The diff coverage is 98.56%.

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   97.73%   97.91%   +0.17%     
==========================================
  Files          21       21              
  Lines        6767     7084     +317     
==========================================
+ Hits         6614     6936     +322     
+ Misses        122      115       -7     
- Partials       31       33       +2     

Impacted Files	Coverage Δ
engine/float.go	0.00% <ø> (-93.88%)	⬇️
engine/integer.go	0.00% <ø> (-97.37%)	⬇️
engine/variable.go	86.36% <53.84%> (-13.64%)	⬇️
engine/vm.go	86.28% <90.47%> (+3.43%)	⬆️
engine/clause.go	98.63% <96.36%> (-1.37%)	⬇️
engine/env.go	98.87% <99.32%> (+0.77%)	⬆️
engine/builtin.go	97.55% <99.50%> (+0.10%)	⬆️
cmd/1pl/interpreter.go	100.00% <100.00%> (ø)
engine/atom.go	100.00% <100.00%> (ø)
engine/compound.go	100.00% <100.00%> (ø)
... and 13 more

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