Function pairCollSize2

src/common/pairs.ts:8–11

(
  pair: Pair<Coll<unknown>>,
  func: any = collSize2,
)

export const pairNew = <Value>(value: Value): Pair<Value> => [value, value];

export const pairCollSize2 = (
  pair: Pair<Coll<unknown>>,
  func: any = collSize2,
): number => func(pair[0]) + func(pair[1]);

export const pairNewMap = <Value>(): Pair<IdMap<Value>> => [mapNew(), mapNew()];