Adds a test, it already passes, doesn't find anything new
Add another passing test
Changes test to more closely mirror broken internal code
Fix typed self-join
Merge pull request #288 from johnynek/feature/anotherTest

Add another passing test
Merge pull request #287 from johnynek/feature/groupAlljoinTest

Adds a test, it already passes, doesn't find anything new
Add comments to CoGrouped2
Merge pull request #296 from twitter/bugfix/typed-selfjoin

Fix typed self-join