Type safe and preserving version of `Object.entries` and `Object.fromEntries`

entries.ts

type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends (
  k: infer I
) => void
  ? I
  : never;

type UnionToOvlds<U> = UnionToIntersection<
  U extends any ? (f: U) => void : never
>;

type PopUnion<U> = UnionToOvlds<U> extends (a: infer A) => void ? A : never;

type IsUnion<T> = [T] extends [UnionToIntersection<T>] ? false : true;

type UnionToArray<T, A extends unknown[] = []> = IsUnion<T> extends true
  ? UnionToArray<Exclude<T, PopUnion<T>>, [PopUnion<T>, ...A]>
  : [T, ...A];

type ZipArray<X extends Array<any>, Y extends Array<any>, R extends Array<any> = []> = 
  X extends [infer HX, ...infer TX extends Array<any>]
  ? Y extends [infer HY, ...infer TY extends Array<any>]
    ? ZipArray<TX, TY, [...R, [HX, HY]]>
    : R
  : R;

type ValueOf<X extends Record<string, unknown>, K extends Array<keyof X>, R extends Array<unknown> = []> = 
  K extends [infer H extends string, ...infer T extends Array<keyof X>]
  ? ValueOf<X, T, [...R, X[H]]>
  : R;

type Entry = readonly [string, unknown]
type Entries = readonly Entry[]

type FromEntriesToObject<E extends Entries, R = {}> = 
  E extends readonly [infer H extends Entry, ...infer T extends Entries] 
  ? FromEntriesToObject<T, R & {[X in H as X[0]]: X[1]}>
  : E extends readonly []
  ? R
  : never;

type FromObjectToEntries<X extends Record<string, unknown>, K = UnionToArray<keyof X>> = 
  K extends Array<keyof X>
  ? ZipArray<K, ValueOf<X, K>>
  : never;

function fromEntries<const T extends Entries>(entries: T): FromEntriesToObject<T>
function fromEntries(entries: Array<[string, unknown]>) {
    return Object.fromEntries(entries);
}

function toEntries<const T extends Record<string, unknown>>(r: T): FromObjectToEntries<T>
function toEntries(r: any) {
  return Object.entries(r);
}

// Prove the roundtrip 
const x = {foo: 1, bar: undefined, baz: "baz"} as const
const y = toEntries(x)
const z: typeof x = fromEntries(y)

Unfortunately there is very little that can be done with the returned array besides immediately reassembling the object. In particular, "Property 'map' does not exist on type 'FromObjectToEntries<D, UnionToArray<keyof D, []>>'.