"I think the 0-arity versions of these functions have been added during the 
work on reducers, to allow them to serve as reducing functions. Without going 
into reducers (or transducers, for that matter!), they place a number of 
requirements on reducing functions, among which that they should be associative 
and have a neutral element, and that they return that neutral element when 
called with no argument."

I am not sure why you think this, but it's wrong. (+) => 0 and (*) => 1 have 
been around since Clojure's inception, and indeed, these arities have been 
defined in Lisp for as long as I can recall. They have certainly been 
standardized for Common Lisp for at least a couple of decades now. 

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