Differences Between `Effect.gen` and `Effect.fn` Usage in Functions

const divideGen = (a: number, b: number) =>
  Effect.gen(function* () {
    if (b === 0) return yield* Effect.fail("Cannot divide by zero")
    return a / b
  })

const divideFn = Effect.fn(function* (a: number, b: number) {
  if (b === 0) return yield* Effect.fail("Cannot divide by zero")
  return a / b
})