I've just pushed a small read me change and the Travis CI test are now failing on rubinius: http://travis-ci.org/#!/andrew/split/builds/1389933
Not sure whats changed but it looks like an upgrade to rubinius.
I won't be able to look at this for a couple weeks so any help would be appreciated.
Fix failing tests on Rubinius (issue #52)
Please let us at Rubinius also know about things like this. If this is an issue with Rubinius, we should also fix it there. Do you have a small reproduction for us that shows the issue?