History malfunctioning in Windows with Cygwin

Bond tab completion and history work great in different OS's and environments, even in Command Prompt :)

However, in Git Bash, a form of msysgit / MSYS / Cygwin, pressing up/down fails to clear the line first, resulting in the history being appended to the current line rather than replacing it.

System:

$ specs ruby bash git os
Specs:

specs 0.2
https://github.com/mcandre/specs#readme

gem --version
2.0.0

ruby --version
ruby 1.9.3p374 (2013-01-15) [i386-mingw32]

bash --version
GNU bash, version 3.1.0(1)-release (i686-pc-msys)
Copyright (C) 2005 Free Software Foundation, Inc.

git --version
git version 1.8.0.msysgit.0

systeminfo | findstr /B /C:"OS Name" /C:"OS Version"
OS Name:                   Microsoft Windows XP Professional
OS Version:                5.1.2600 Service Pack 3 Build 2600

bond is only used in ruby consoles e.g. irb,ripl or pry. Which of these are you using with your windows setup? I'm not using windows but I'm open to a pull request

Yes, I'm using bond with irb. It works great in Command Prompt, but when I try to use Cygwin terminals, then it doesn't work so well.