primus/substream — pull request #3 by aslakhellesoy (2014-01-07 10:03:26+00:00)
Title: Proxy readyState to parent stream

So I don't need to do ugly hacks [like this](https://github.com/aslakhellesoy/share-primus/blob/5779dc743570df0decaac83ddba63bcec5b90f9a/share-primus.js#L17-L19)