proper duals for JacVec

[ChrisRackauckas]

No description provided.

[codecov-commenter]

Codecov Report

Merging #172 (7c8723e) into master (5152045) will decrease coverage by 0.06%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   78.77%   78.70%   -0.07%     
==========================================
  Files          14       14              
  Lines         749      756       +7     
==========================================
+ Hits          590      595       +5     
- Misses        159      161       +2     

Impacted Files	Coverage Δ
src/differentiation/jaches_products.jl	96.59% <87.50%> (-1.28%)	⬇️
src/differentiation/jaches_products_zygote.jl	100.00% <100.00%> (ø)

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