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Obviously this needs to move upstream to xdrgen (I will post a version of the minimal change needed there too) but this is a sketch of what support for
Arbitrary
looks like. Very straightforward -- the only question I think I have is whether @leighmcculloch you'd like it to be cfg'ed behind another feature or not. Argument for feature-cfg'ing is that obviously "it's more code" people might not want to compile; argument against is that "every feature makes a larger powerset".