What about Function.identity/0, that returns an anonymous identify function?

def identity(), do: &(&1)

So usage would look like:

Enum.map(list, Function.identity())

That (to me) works just as well as Function.identity/1, and keeps with the 
convention of functions in the Function module returning functions.

It is an additional layer of indirection, but I honestly don’t think this is 
going to be a feature that’s used by anyone other than advanced users. It might 
be confusing to those new to FP,  but those folks won’t even think to use this 
feature, at least not by name.

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