number.multiple() accepts only integers (throws exception). It neither accepts floats/decimals nor does it accept refs.

So, it accepts number.multiple(2), but does not accept number.multiple(2.5).
It also does not accept number.multiple(Joi.ref('anotherKey')).

It seems the code here explicitly throws a exception for anything non-integer.

Is this by design? Or a bug?

If it is by design, I am wondering why is it so, and also in such case should it not send the error gracefully for validate call instead of throwing exception!