nonzero?() public

Returns num if num is not zero, nil otherwise. This behavior is useful when chaining comparisons: 

   a = %w( z Bb bB bb BB a aA Aa AA A )
   b = a.sort {|a,b| (a.downcase <=> b.downcase).nonzero? || a <=> b }
   b   #=> ["A", "a", "AA", "Aa", "aA", "BB", "Bb", "bB", "bb", "z"]
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