unique error kinds

[samuelcolvin]

fix #281

[codecov-commenter]

Codecov Report

Merging #285 (fb1f65f) into main (29ae322) will increase coverage by 0.07%.
The diff coverage is 96.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #285      +/-   ##
==========================================
+ Coverage   97.75%   97.82%   +0.07%     
==========================================
  Files          52       52              
  Lines        5916     5930      +14     
  Branches       44       44              
==========================================
+ Hits         5783     5801      +18     
+ Misses        133      129       -4     

Impacted Files	Coverage Δ
src/errors/mod.rs	92.30% <ø> (ø)
src/validators/time.rs	97.82% <ø> (ø)
src/errors/kinds.rs	89.33% <95.12%> (+3.19%)	⬆️
src/input/datetime.rs	97.84% <100.00%> (ø)
src/input/input_json.rs	96.17% <100.00%> (ø)
src/input/input_python.rs	98.46% <100.00%> (ø)
src/input/return_enums.rs	97.93% <100.00%> (ø)
src/input/shared.rs	100.00% <100.00%> (ø)
src/lib.rs	100.00% <100.00%> (ø)
src/validators/date.rs	96.34% <100.00%> (ø)
... and 7 more

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