StringSlice<S, Start, End> returns incorrect type when S is non-literal string

[ghaaj]

Bug description

import type {StringSlice} from 'type-fest';

type Slice = StringSlice<string, 0, 1>; // string[]

type-fest/source/string-slice.d.ts

Lines 29 to 37 in cfb5947

	export type StringSlice<
	S extends string,
	Start extends number = 0,
	End extends number = StringToArray<S>['length'],
	> = string extends S
	? string[]
	: ArraySlice<StringToArray<S>, Start, End> extends infer R extends readonly string[]
	? Join<R, ''>
	: never;

Line 34 should be modified to replace string[] with string.

Repro

https://www.typescriptlang.org/play/?#code/JYWwDg9gTgLgBDAnmApnA3gZRlYA7Ac0wBtgBjFAXzgDMoIQ4ByJVAWhpQGcYmBuALAAoYazQlyaALxxsuQhIoAeHvIIAaOAAZNARgB8goQEgA9KbgA9APzCzF1fgJxgXOCgAeqMjBQATTTwIeEdCAG0AXWEgA