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This is great. One small bug cropped up, I collaborated on a fiddle with a work colleague and he couldn't see any output from clicking Run.

Great work though, will be in my favourites :)

Yes, will be fixed by tomorrow. Thanks for reporting it.

Good stuff!

Those are some curious methods, but I'm not sure the names fold and foldback are appropriate given what they actually do.

You're right, they don't work. I was flattening recursive versions of Fold and FoldBack as a test of DotNetFiddle. Clearly the flattening has bugs :)