From: Brian Candler <b.candler@...>
Date: 2008-10-28T20:20:01+09:00
Subject: Re: Hash.merge_add! extension - how does this code look?

Thomas Sawyer wrote:
>> � # output: {1=>["foo","bar"], 2=>"baz"}
> 
>>> {"foo"=>1, "bar"=>1, "baz"=>2}.invert
> => {1=>"bar", 2=>"baz"}

That's the standard Hash#invert, and as you demonstrate, it loses 
information in the case where multiple keys map to the same value.
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