From: Jason Merrill <jason.merrill@...>
Date: 2006-09-05T21:57:34+09:00
Subject: Re: Binary Search Using Lambda

As an aside, I would be warry of building functions that return array
indices, or -1 if they fail.  In ruby, -1 is a valid array index,
referring to the last element in the array.  Might be better to return
nil to avoid later mistakes and confusion.

Jason