Validates that a value is a string (binary).

Optional Options

• :message - Custom error message callback (value -> String.t())

Examples

iex> Funx.Validator.String.validate("hello")
%Funx.Monad.Either.Right{right: "hello"}

iex> Funx.Validator.String.validate(42)
%Funx.Monad.Either.Left{left: %Funx.Errors.ValidationError{errors: ["must be a string"]}}