Is Reactive Extensions open-source?

.net, system.reactive

Solution

In case you've missed it, Rx is now open-source: http://blogs.msdn.com/b/interoperability/archive/2012/11/06/ms-open-tech-open-sources-rx-reactive-extensions-a-cure-for-asynchronous-data-streams-in-cloud-programming.aspx

- http://rx.codeplex.com/

- https://github.com/Reactive-Extensions/Rx.NET

Problem

Is Reactive Extensions open-source? Will Microsoft open-source it? I'm looking to read the source code to better understand how it's implemented. I'd like to see the unit tests, so I can run them against some of my own code reimplementing some of `Reactive.Linq`. I know Microsoft open-sourced F# which is handy for developers https://github.com/fsharp/fsharp

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