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I agree the need to explicity upcast has been annoying. I'm hoping they will do a compiler optimzation to fix that in a future release. Also, hopefully they will bring in the co/contra variance features that are now in C# for lists and apply them to Tuple as well. (Does Don Syme read HN?)

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I don't know if he reads HN but I believe the F# team is aware of the upcasting issue and if I remember correctly they were thinking about resolving this in the future. You can send him an email saying what you like and what are your biggest issues, he'll probably appreciate that (at least I would).

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