Typescript type for `just-partition` does not narrow type correctly when using a type guard

The Typescript type for `just-partition` does not narrow type correctly when using a type guard

I'm not sure what the best way to report/describe TS issues, so I will use screenshots,
I hope that that is okay,

In contrast with how using `Array.filter()` correctly narrows the type

The type returned from `partition`, when using the example type guard, is a tuple of unions of the possible values

```TS
[PromiseRejectedResult | PromiseFulfilledResult, PromiseRejectedResult | PromiseFulfilledResult]
```

What I would really like/expect is that the types would be correctly inferred, in the same way that `Array.filter()` does

```TS
[ PromiseFulfilledResult, PromiseRejectedResult ]
```

I can work around this by casting the result, but that is not ideal

I have a suggested fix, using a function Type override

I will open a PR,

I just wanted to link the PR to an issue