Unmarshalling failure happens before validation failure

[maxsokolovsky]

Looks like for some use-cases govalidator tries to unmarshal request body fields into Go struct fields before running validation. I have a struct:
type S struct { Foo bool `json:"foo"` }

And the following rules:
rules := govalidator.MapData{"foo": []string{"bool"}}

On request, foo could be specified as a value of any type, govalidator should notice that a value cannot be cast to a boolean. But because the struct value is of type bool (and not string, interface{}, etc.), govalidator does not run validation, it first tries to unmarshal the value into a proper bool value of the struct, which fails if the provided value is a string, for example. Should the order be different? Should it stop at the validation error without failing on an unmarshalling error?

[insanrizky]

Is there any solution for this?