Droppers and Dispensers aren't triggered by 1 or 2 tick pulses

Pulses of 2 or less ticks have no effect on dispensers

Repro Steps:
1. Create a 1 or 2 tick clock or pulse limiter, such as a loop of 2 Repeaters each on 2 tick setting. (see attached image)
2. Connect it to a dispenser and place some items in it.
3. Activate the clock/pulse limiter.

Result: No item is dispensed.

Expected Result: Any length pulse will activate the dispenser (which was the behavior prior to Snapshot 13w01a)