Fix the custom type error validation

[w3nl]

No description provided.

[codecov]

Codecov Report

Merging #170 (0b8c695) into master (5a9ffcb) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #170   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         2    +1     
  Lines           34        37    +3     
  Branches         7         9    +2     
=========================================
+ Hits            34        37    +3     

Impacted Files	Coverage Δ
src/schemas/test2.js	100.00% <100.00%> (ø)
src/validator.js	100.00% <100.00%> (ø)

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