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                                            Kay Hwang

Arrays lose all type information if they are allowed to be null

Also, when writing Joi code like this `Joi.array().items(Joi.string()).required().allow(null)`, it infers `(string | null)[]` but I think it would be `string[] | null`. ![image](https://user-images.githubusercontent.com/26626706/103458698-fac58000-4d4d-11eb-953c-765551e2bf08.png)