As a diff is sometimes clearer than words, here's an additional one addressing some discussions above (it's on top of my previous patch, but I don't mean to suggest they should be applied as-is). It includes _provided() that can tell the caller whether it was the winner, user_data for the vfuncs, and a fairly thorough multi-extension support.
Nice, you pretty much did it for me, thanks! I'll just apply it, call it mine code and everyone will be happy :-).
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