describe('Task parallel execution', () => {
  it('fetches all in parallel', async () => {
    const start = Date.now()
    const result = await fetchAllParallel([1, 2, 3])()
    const duration = Date.now() - start

    expect(result).toEqual([10, 20, 30])
    expect(duration).toBeLessThan(25) // Should be ~10ms, not 30ms
  })

  it('combines three tasks in parallel', async () => {
    const result = await combineThree(T.of(10), T.of(20), T.of(30))()
    expect(result).toBe(60)
  })
})