smosh(
  {
    prop1: cold('h-h-i-i-i-i-i', { h, i }),
    prop2: cold('_-a-a-_-b-_-b', { _, a, b }),
    prop3: cold('f-f-f-f-f-t-t', { f, t }),
  },
  undefined, // having to pass undefined or [] is not intuitive
  { durationSelector: cold('s') }
);

smosh(
  {
    prop1: cold('h-h-i-i-i-i-i', { h, i }),
    prop2: cold('_-a-a-_-b-_-b', { _, a, b }),
    prop3: cold('f-f-f-f-f-t-t', { f, t }),
  },
  { durationSelector: cold('s') }
);

smosh(
  {
    prop1: cold('h-h-i-i-i-i-i', { h, i }),
    prop2: cold('_-a-a-_-b-_-b', { _, a, b }),
    prop3: cold('f-f-f-f-f-t-t', { f, t }),
  },
  { durationSelector: cold('s'), spreads: [prop$] }
);