Direction refactor

[rb004f]

No description provided.

[codecov]

Codecov Report

Merging #196 into master will increase coverage by 3.65%.
The diff coverage is 86.38%.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
+ Coverage   68.29%   71.95%   +3.65%     
==========================================
  Files          36       36              
  Lines        3429     3420       -9     
==========================================
+ Hits         2342     2461     +119     
+ Misses       1087      959     -128     

Impacted Files	Coverage Δ
src/core/base.jl	99.38% <ø> (-0.01%)	⬇️
src/core/ref.jl	96.90% <ø> (-0.07%)	⬇️
src/form/lp.jl	24.24% <0.00%> (-3.54%)	⬇️
src/form/mip.jl	25.00% <0.00%> (+5.00%)	⬆️
src/form/nlp.jl	57.37% <0.00%> (-0.96%)	⬇️
src/prob/nels.jl	34.40% <75.00%> (+4.70%)	⬆️
src/core/variable.jl	93.13% <92.85%> (+3.28%)	⬆️
src/core/constraint_template.jl	84.93% <95.77%> (+13.34%)	⬆️
src/core/constraint.jl	62.79% <100.00%> (+10.50%)	⬆️
src/core/constraint_mi.jl	78.33% <100.00%> (+3.66%)	⬆️
... and 11 more

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