Is there a Ruby Hash#to_s equivalent for the 'new' Hash syntax?

Hash#to_s (alias for inspect) always outputs data in the 1.8 hash style: ``` {key: "value"}.to_s => "{:key=>\"value\"}" ``` Is there any core method that will serialize it in the 1.9 hash style? ``` {key: "value"}.to_s => "{key: \"value\"}" ``` I'm using this on known data for code refactoring; and since Ruby tends to have an implementation of everything, I'm hoping I was just looking in the wrong place. Of course, you could hack it in an ugly fashion ``` "{" + my_hash.to_a.map{|pair| pair[0].to_s + ": " + pair[1].inspect} * ",\n") + "}" ``` But I'm hoping there's a core method somewhere that's unit tested and fully correct.