I'm getting funny behavior when using irb (readline) on Windows.  When
I go back to a very long line in the history, I can't edit it.  After
hit the left arrow a few times, the cursors moves *up* a line, and not
left anymore.  At that point, I can't figure out what I'm typing, and
so I have to Ctrl-C.

Does anyone else experience this problem?  More importantly, is there a
way to fix it?

Any ideas or help appreciated.