Negative numbers are not treated like type literals

TypeScript Version: 3.4.5

Search Terms: negative keys key

Code

type Value = {
    [-1]: any;
};

Expected behavior:
No compiler errors.

Actual behavior:
Compiler error: A computed property name in a type literal must refer to an expression whose type is a literal type or a 'unique symbol'

Playground Link: playground link

Related Issues: #31460

While this error might seem sensible, notice how this very similar code does not produce any errors:

type Values = {
    [1]: any;
};

[kitsonk]

And this works as well:

const MinusOne = -1;

type Values = {
	[1]: any;
	[MinusOne]: any;
};

[andrewbranch]

I'm assigning myself since it's related to #31460, but if someone else had plans for it, feel free to take it back