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This could be an optional behavior, but I think it would be a very user-friendly feature. I always thought that doing this would be too expensive, since retrieving variable types involves creating variable objects and all that. But it turns out that GDB can do this with -stack-list-arguments call. See http://sourceware.org/ml/gdb/2009-06/msg00320.html.
Nice. I was wondering where you were headed when you were asking about -stack-list-arguments :-)