Timers don't always fire if the tick duration isn't a multiple of 1ms

[thomaswhiteway]

For example, the following code may or may not terminate.

let timer = wheel()
    .tick_duration(Duration::new(0, 100_000))
    .build();
timer.sleep(Duration::from_millis(10)).wait().unwrap();

I suspect the problem is that the tick duration is rounded up to the next full ms for the wheel, but not for the tolerance, so the worker can unpark the task for the timer before it's ready to fire.

The solution may just be to disallow invalid tick durations.

[carllerche]

Good catch, definitely a bug.