While working on the DevTools profiler, I've noticed that durations are sometimes incorrect. This seems to be vaguely related to high/low priority state updates. Need to track this down more so I'm filing an issue for myself.
current: Fiber | null,
  workInProgress: Fiber,
  renderExpirationTime: ExpirationTime,
) {
  const nextChildren = workInProgress.pendingProps;
  reconcileChildren(
    current,
    workInProgress,
    nextChildren,
    renderExpirationTime,
  );
  memoizeProps(workInProgress, nextChildren);
  return workInProgress.child;
}
function updateMode(
  current: Fiber | null,
  workInProgress: Fiber,
  renderExpirationTime: ExpirationTime,
) {
  const nextChildren = workInProgress.pendingProps.children;
  reconcileChildren(
    current,
    workInProgress,
    nextChildren,
    renderExpirationTime,
  );
  memoizeProps(workInProgress, nextChildren);
  return workInProgress.child;
}
function updateProfiler(