if (task.nextExecuteNanoTime <= executeNanoTime) {
        taskRunner.logger.taskLog(task, this) { "already scheduled" }
        return false
      }
      futureTasks.removeAt(existingIndex) // Already scheduled later: reschedule below!
    }
    task.nextExecuteNanoTime = executeNanoTime
    taskRunner.logger.taskLog(task, this) {
      if (recurrence) {
        "run again after ${formatDuration(executeNanoTime - now)}"