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.
cancelDeferredCallback,
  prepareForCommit,
  resetAfterCommit,
} from './ReactFiberHostConfig';
import {
  markPendingPriorityLevel,
  markCommittedPriorityLevels,
  markSuspendedPriorityLevel,
  markPingedPriorityLevel,
  hasLowerPriorityWork,
  isPriorityLevelSuspended,
  findEarliestOutstandingPriorityLevel,
} from './ReactFiberPendingPriority';
import {
  recordEffect,
  recordScheduleUpdate,
  startRequestCallbackTimer,
  stopRequestCallbackTimer,
  startWorkTimer,
  stopWorkTimer,
  stopFailedWorkTimer,
  startWorkLoopTimer,
  stopWorkLoopTimer,
  startCommitTimer,
  stopCommitTimer,
  startCommitSnapshotEffectsTimer,
  stopCommitSnapshotEffectsTimer,
  startCommitHostEffectsTimer,
  stopCommitHostEffectsTimer,
  startCommitLifeCyclesTimer,