Backspace query string under _MinChars fires request

[mattbt]

Hi,
I experienced some problems when using backspace button.
If I search for a string, e.g. "abcd", wait for request to be done, then delete some letters ending with a string with length < _MinChars

e.g.
_MinChars = 2
search text = "abcd" -> "abc" -> "ab" -> "a"

the request gets sent with query parametes ="a" (which shouldn't, since its lenght is 1) and results gets cached under "ab".
Anyone else experiencing this behaviour?
Maybe timeout should be cleared when query string goes under _MinChar?