>>>>> "G" == Gavin Sinclair <gsinclair / soyabean.com.au> writes:

G> A. "Arrays are not comparable in general."
G> B. Array implements <=>.

G> Seems like a contradiction to me.

 Well, if you look at the classes which include Comparable you'll see that
 #<=> return (-1, 0, 1) when the 2 objects are in the same class (this is
 simplified, see for example String#<=>) 

 This is not the case for Array

svg% ruby -e 'p ([1, "a"] <=> [1, 2])'
nil
svg% 

 You have 2 arrays, but ruby can't compare these objects


Guy Decoux