title: Programmatically getting FULL Ruby version?
body: <p>I know it's possible to get the Ruby version (e.g. "1.9.3") via the <code>RUBY_VERSION</code> constant.  However, I want to know how to go about determining the exact version (e.g.: "1.9.3-p0").  The reason is that there is a bug that was not fixed in earlier versions of Ruby 1.9.3 that is working in later versions, and I want some code in a gem I'm working on to account for this.</p>