What problem does this feature solve?

在 triggerEffects 函数中，对 dep 的判断多余，将 dep:Set 展开到一个数组的操作多余。 下图是所有用到 triggerEffects 函数的地方：

dep 参数不可能是Array，而且dep是Set对象，可以直接for of 遍历。

export function triggerEffects(
  dep: Dep | ReactiveEffect[],
  debuggerEventExtraInfo?: DebuggerEventExtraInfo
) {
  // spread into array for stabilization
  const effects = isArray(dep) ? dep : [...dep]
  for (const effect of effects) {
    if (effect.computed) {
      triggerEffect(effect, debuggerEventExtraInfo)
    }
  }
  for (const effect of effects) {
    if (!effect.computed) {
      triggerEffect(effect, debuggerEventExtraInfo)
    }
  }
}

What does the proposed API look like?

export function triggerEffects(
  dep: Dep,
  debuggerEventExtraInfo?: DebuggerEventExtraInfo
) {
  for (const effect of dep) {
    if (effect.computed) {
      triggerEffect(effect, debuggerEventExtraInfo)
    }
  }
  for (const effect of dep) {
    if (!effect.computed) {
      triggerEffect(effect, debuggerEventExtraInfo)
    }
  }
}