Undefined is always valid regardless of type

[cmawhorter]

All types are incorrectly reporting undefined as valid. Array is the exception because of #33

Enjoi({ type: 'string' }).validate(undefined, console.log.bind(console, 'string'));
Enjoi({ type: 'array' }).validate(undefined, console.log.bind(console, 'array'));
Enjoi({ type: 'boolean' }).validate(undefined, console.log.bind(console, 'boolean'));
Enjoi({ type: 'number' }).validate(undefined, console.log.bind(console, 'number'));
Enjoi({ type: 'integer' }).validate(undefined, console.log.bind(console, 'integer'));
Enjoi({ type: 'object' }).validate(undefined, console.log.bind(console, 'object'));
Enjoi({ type: 'string' }).validate(undefined, console.log.bind(console, 'string'));

No ValidationError for any of those and the value returned is undefined.

(Sorry for the deluge!)

[tlivings]

These should fail against null, but don't because undefined means there is nothing to validate against. It will fail properly if you set keys as required and pass undefined.

I see this behavior in json schema validation as well.

That's not a final answer but first thoughts.

[tlivings]

At the end of this day, this behavior is based on Joi. These properties are not necessarily required, but Joi passes validation because they are not marked as required. I don't think there is anything to fix here.