fails:Array#sort does not call #<=> on contained objects when invoked with a block
fails:Array#sort does not call #<=> on elements when invoked with a block even if Array is large (Rubinius #412)
fails:Array#sort completes when supplied a block that always returns the same result
fails:Array#sort raises an error if objects can't be compared
fails:Array#sort! does not call #<=> on contained objects when invoked with a block
fails:Array#sort! does not call #<=> on elements when invoked with a block even if Array is large (Rubinius #412)
fails:Array#sort! completes when supplied a block that always returns the same result
fails:Array#sort! ignores any changes of self which would take place during sort!ing
