Function chain

packages/effect-app/src/Set.ts:195–200

(
  E: Equivalence.Equivalence<B>
)

 * Map + Flatten
 */
export function chain<B>(
  E: Equivalence.Equivalence<B>
): <A>(f: (x: A) => Set<B>) => (set: Set<A>) => Set<B> {
  const c = chain_(E)
  return (f) => (set) => c(set, f)
}

/**
 * Map + Flatten