Register a custom type func for validation #98
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Create a new function RegisterCustomTypeFunc that allow registering a function against a number of types
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Since a recent version of go-playground/validator, it's no longer possible to validate a struct that implement the Valuer interface. For this purpose, the project maintainer advises writing a custom pre-validation function to extract the field content to validate.
https://github.com/go-playground/validator/blob/master/_examples/custom/main.go