Array#<=> should not raise when comparison fails
ruby 1.9.2dev (2009-10-25 trunk 25457) [x86_64-darwin10.0.0]
Since the addition of Object#<=>, the only comparison that raised an error was Array#<=>(not_an_array).
Array#<=>(obj) now returns nil if obj is not array-like.
Maybe this should also be applied in the 1.8 line?
Note: neither test-all nor rubyspec were testing for this.
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