// Test the `push` and `pop` methods.
#{
  let tasks = (a: (1, 2, 3), b: (4, 5, 6))
  test(tasks.at("a").pop(), 3)
  tasks.b.push(7)
  test(tasks.a, (1, 2))
  test(tasks.at("b"), (4, 5, 6, 7))
}