Bundler_gemspec_bug is a project mainly written in ..., it's free.
Demonstration of a bug in bundler
✗ ruby --version ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-darwin10.6.0] ✗ gem --version 1.5.2 ✗ bundle --version Bundler version 1.0.10