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Well, here's the source: http://referencesource.microsoft.com (under the MS reference license)

That's not opensource.

(I know you know that, but I'm just saying)

Also, it provides nothing more than ilspy does (and ilspy shows the actual code on your machine)

Decompiling certainly does not provide the same code or info as reference source.

When debugging, you usually want to see the exact code that's being run - not a "reference" version which may not have the certain bit of code that you're trying to workaround/call.

The only advantage that the reference code is the variable names are original, and there's a few comments (but no XML documentation?).

vNext is, under a separate account: https://github.com/aspnet/Home

Not sure why you were downvoted, but apparently, it is too much to ask.