[r6rs-discuss] Incorrect sample code for vector-sort!

[Llewellyn Pritchard]

(define v (vector 3 5 2 1))
(vector-sort! v)     =) unspecified
v                           =) #(1 2 3 5)

According to the definition, vector-sort! should take a procedure as the 
first argument.
Is the proc argument perhaps optional?

Thanks

leppie