by Anthony Fu @antfu
Implement the JavaScript Array.slice function in the type system. Slice<Arr, Start, End> takes the tree argument. The output should be a subarray of Arr from index Start to End. Indexes with negative numbers should be counted from reversely.
For example
type Arr = [1, 2, 3, 4, 5]
type Result = Slice<Arr, 2, 4> // expected to be [3, 4]
