From: Roger Pack <rogerdpack2@...>
Date: 2010-08-17T06:20:04+09:00
Subject: Re: 1.9.2 RC2 Uses 1.9.1 for various directories

> This means that Ruby 1.9.2 is API compatible with 1.9.1

The only incompatibility I've found is ruby-debug gem.  Perhaps it
should be moved into core?
-r