From: Kristof Bastiaensen <kristof@...>
Date: 2004-08-08T03:26:22+09:00
Subject: Re: Sets are not extensional

hi,

On Sat, 07 Aug 2004 16:45:22 +0000, Reimer Behrends wrote:
> Note that to_a.hash is effectively non-deterministic. If @hash == { 1 =>
> true, 2 => true }, then to_a can be both [1, 2] and [2, 1], with different
> hash values. 

As far as I know, hash.to_a always generates the same array.
The reason is that hashes are in fact unordered, so if you 
give the same elements in a different order, it is still the 
same Hash.  That means that when hash1 == hash2, then 
hash1.to_a == hash2.to_a.  So fortunately there is no need to 
use map or sort.

Regards,
KB