From: MenTaLguY <mental@...>
Date: 2008-04-01T06:30:21+09:00
Subject: Re: Hash insertion order preservation in ruby1.9

On Tue, 1 Apr 2008 06:18:51 +0900, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
> |(1) Can I rely upon hash insertion order preservation as an approved
> |new feature of Ruby, without any risk that it may get lost again in
> |future releases ?
> 
> For CRuby, yes.  For Ruby the language, we have to make up consensus
> with other implementations.

I think it is safe to say it will remain in JRuby as well.  The new
behavior has allowed us to optimize hash iteration since it is now
entirely deterministic.

-mental