Support nil or empty uuid

Is your feature request related to a problem? Please describe.

I wanted to go ahead and make a PR for adding nil uuid which is a special case. Before doing the work, I just wanted to double check to see if this has been considered before or there are any objections to it.

You can read more about nil uuid https://en.wikipedia.org/wiki/Universally_unique_identifier#Nil_UUID

Describe the solution you’d like

I was thinking about adding nill to the namespace so the user can write the following code:

import { nil } from 'uuid';
console.log(nil()); // => '00000000-0000-0000-0000-000000000000'

I believe that is valid for all versions, so we dont need to implement it under v1, v2, etc. Let me know your thoughts and I’ll get to it.

[IsaiahJTurner]

I don’t have any opinions on this feature but just saw the issue and wanted to share a nil uuid use case from: https://developer.apple.com/documentation/adsupport/asidentifiermanager/1614151-advertisingidentifier

The advertisingIdentifier is an alphanumeric string unique to each device, that you only use for advertising. Specific uses are for frequency capping, attribution, conversion events, estimating the number of unique users, advertising fraud detection, and debugging. The advertising identifier has a value of 00000000-0000-0000-0000-000000000000 until authorization is granted or when using the Simulator.

So, there are a lot of client’s which do conditional logic on the backend to handle it. Why Apple does this perplexes me but they do.

[ali92hm]

Yes, I was able to make the following work

console.log(uuid.NIL)