validating against a schema with array include/exclude may throw an exception

[iamdoron]

the following test throws:

var schema = {
    arr: Joi.types.Array().includes(Joi.types.Number().integer())
};

var input = { arr: [1, 2, 2.1] };
var err = Joi.validate(input, schema);

expect(err).to.exist;
done();

It happens with almost any variation of types with constraints in include (also for excludes)

another example that throws:

var schema = {
    arr: Joi.types.Array().includes(Joi.types.String())
};

var input = {arr:["1","2","2.1", 2]};
var err = Joi.validate(input, schema);

expect(err).to.exist;
done();

exception for the first case:

TypeError: Cannot call method 'split' of undefined
      at internals.Errors.add (joi/lib/errors.js:20:24)
      at Array.1 (/joi/lib/types/number.js:113:20)
      at Array.1 (/joi/lib/types/array.js:125:47)
      at internals.BaseType.validate (/joi/lib/types/base.js:408:42)
      at validateKeyConfig (/joi/lib/index.js:81:39)
      at processConfig (/joi/lib/index.js:46:13)
      at Object.exports.validate (/joi/lib/index.js:100:5)
      at /joi/test/index.js:501:23
      at Object._onImmediate (/joi/node_modules/lab/lib/execute.js:238:12)
      at processImmediate [as _immediateCallback] (timers.js:330:15)