>  (side note: what is different between Long/MAX_VALUE and the 
> function call (Long/MAX_VALUE)?

None. Both are syntax sugar for (. Long MAX_VALUE)

> It seems like unchecked-multiply doesn't like vars, but thats surprising.
> What am I doing wrong here?

unchecked-multiply only does unchecked arithmetic when the arguments are 
primitive. Vars cannot have primitive values, they must be boxed as 
java.lang.Long. So it reverts to normal Clojure arithmetic.

The unchecked-* functions are intended as a performance optimization when 
doing operations with primitives.

-S

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