Describe the problem you are trying to fix (provide as much context as possible)

Let's assume I have this validation schema :

Joi.object().keys({
foo : Joi.number()
});

With this schema both of this object will be validated since Joi works with number as strings :

let a = {foo : 42};

let b = {foo: "42"};

It's perfectly right for me, but the problem comes when I'm trying to work with the valid() method :

Joi.object().keys({
foo : Joi.number().valid([41, 42, 43])
});

//this schema will validate the a object but not the b object

Is there any way to validate the b object in a more elegant way than :

Joi.object().keys({
foo : Joi.number().valid([41, 42, 43, "41", "42", "43"])
});

Which API (or modification of the current API) do you suggest to solve that problem ?

Maybe add a flag to the valid method ?

Are you ready to work on a pull request if your suggestion is accepted ?

Yes