title: Is Reactive Extensions open-source?
body: <p>Is Reactive Extensions open-source? Will Microsoft open-source it?</p>
  
  <p>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 <code>Reactive.Linq</code>.</p>
  
  <p>I know Microsoft open-sourced F# which is handy for developers <a href="https://github.com/fsharp/fsharp" rel="noreferrer">https://github.com/fsharp/fsharp</a></p>