Implement a type Sum<A, B> that summing two non-negative integers and returns the sum as a string. Numbers can be specified as a string, number, or bigint.
For example,
type T0 = Sum<2, 3> // '5'
type T1 = Sum<'13', '21'> // '34'
type T2 = Sum<'328', 7> // '335'
type T3 = Sum<1_000_000_000_000n, '123'> // '1000000000123'
import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Sum<2, 3>, '5'>>,
Expect<Equal<Sum<'13', '21'>, '34'>>,
Expect<Equal<Sum<'328', 7>, '335'>>,
Expect<Equal<Sum<1_000_000_000_000n, '123'>, '1000000000123'>>,
Expect<Equal<Sum<9999, 1>, '10000'>>,
Expect<Equal<Sum<4325234, '39532'>, '4364766'>>,
Expect<Equal<Sum<728, 0>, '728'>>,
Expect<Equal<Sum<'0', 213>, '213'>>,
Expect<Equal<Sum<0, '0'>, '0'>>,
]