revert #495

[simeonschaub]

Ref https://github.com/JuliaDiff/ChainRulesCore.jl/pull/495#issuecomment-953320643

[codecov-commenter]

Codecov Report

Merging #503 (4f7a289) into main (c84bfab) will decrease coverage by 0.08%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #503      +/-   ##
==========================================
- Coverage   93.03%   92.95%   -0.09%     
==========================================
  Files          15       15              
  Lines         833      823      -10     
==========================================
- Hits          775      765      -10     
  Misses         58       58              

Impacted Files	Coverage Δ
src/tangent_types/tangent.jl	84.37% <ø> (-1.14%)	:arrow_down:

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[simeonschaub]

Hmm, need to figure out why Diffractor is still broken