From: Andrew Walrond <andrew@...>
Date: 2005-05-05T23:22:11+09:00
Subject: Re: Whats so different about a Hash?

On Thursday 05 May 2005 13:54, Florian Gro� wrote:
>
> I guess you can workaround it like this:
>
> class Hash
>    def hash()
>      [self.to_a, self.class].hash
>    end
> end
>
> Though I am not sure if that is the correct semantics. (It could be the
> case that Hash#eql?() also compares default values.)

Is Hash#to_a guaranteed to sort the elements? My tests show that it does, but 
perhaps .to_a.sort might be safer?


So I propose

 class Hash
  def hash()
   [self.to_s.sort,self.class].hash
  end
  def eql?(other)
   self.hash === other.hash
  end
 end

to consolidate behaviour across ruby versions. Does that look right to you?  
(I'm not worked about the default value)
 
Andrew