From: Sebastian Hungerecker <sepp2k@...>
Date: 2008-11-19T16:36:02+09:00
Subject: Re: Subclassing Hash to enforce value uniqueness ala key uniqueness.

Sebastian Hungerecker wrote:
>   def to_hash
>     @key_value
>   end

This should return @key_value.dup 

>   def invert
>     @value_key
>   end

And this should either return @value_key.dup or another instance of OneToOne 
where the both hashes are switched.

HTH,
Sebastian
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