Autocomplete remote DS won't pick up 2 characters deleted, then same entered

When you have a remote datasource and min character limit of 2, typing 2 letters, deleting them, then typing the same ones gives no results. You can see this on the example: http://jqueryui.com/demos/autocomplete/#remote - try typing 'pi' (get results), delete it and type it again (no results).

I've asked a question about this on stackoverflow.com here: http://stackoverflow.com/questions/3549535/jquery-ui-autocomplete-json-bug - if anyone wants to tell me anything about the bug/ask anything then there's the place.