Right. Sorry, please ignore the proposal to use &X to denote arity, the intent was to rather test the idea to be able to do that in general, not a particular syntax that would facilitate that. Using &/X might be a better candidate since it reflects the arity just the same way function capture does (minus function name, which totally makes sense in case of an anonymous function). Yet there might be way better candidates which can be discovered through discussion I'm sure, if the community is in favor of such extension in principle.
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