Add primitive interfaces

[medmouine]

[codecov[bot]]

Codecov Report

Merging #15 (301eccb) into main (752e31d) will increase coverage by 0.72%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main       #15      +/-   ##
===========================================
+ Coverage   99.27%   100.00%   +0.72%     
===========================================
  Files          11        11              
  Lines         276       263      -13     
===========================================
- Hits          274       263      -11     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
fold/fold.go	100.00% <100.00%> (ø)
identity/identity.go	100.00% <100.00%> (+100.00%)	:arrow_up:
io/io.go	100.00% <100.00%> (ø)
magma/magma.go	100.00% <100.00%> (ø)

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