chore(types): use official NonNullable again

[Andarist]

This reverts the change to use a custom NonUndefined. It was introduced to workaround an issue with TS 4.8 beta:
TS 4.8-beta playground

This is no longer an issue with the stable TS 4.8 though so this workaround is no longer needed:
TS 4.8.4 playground

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[dbismut]

Awesome thanks for tracking this @Andarist, I'll merge soon.

[dbismut]

@Andarist after checking this locally in the repo, I still got an error.
I updated the Typescript sandbox in 4.8.4 to be truer to the Typescript code in the lib, and I do get the error again.

[Andarist]

Hah, this is very interesting!

I've created a playground with some additional checks (here) and I'm 100% certain that this is a bug in TypeScript. I've reported it here.

So this prevents you currently from using the official NonNullable which is very unfortunate - you probably won't be able to use it even once this gets fixed, unless you'd be fine with telling people to upgrade their TS version (for a new patch version).

[dbismut]

Indeed that's weird! Let's leave this open and I'll merge when Typescript upgrades to a new minor. Thanks!