From: Thomas Sawyer <transfire@...>
Date: 2011-08-03T10:29:44+09:00
Subject: [ruby-core:38732] [Ruby 1.9 - Feature #5123] Alias Hash 1.9 as OrderedHash


Issue #5123 has been updated by Thomas Sawyer.


IWon't this break orderedhash gem? 

In any case, now that Hash preserves order, why would anyone ever think about changing it back and break old code?


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Feature #5123: Alias Hash 1.9 as OrderedHash
http://redmine.ruby-lang.org/issues/5123

Author: Alexey Muranov
Status: Assigned
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: 
Target version: 


I read that it was a controversial decision to make Hash in Ruby 1.9 ordered.
It is not clear if the present implementation is the best possible.
I would like to express my thought.

It would be nice if the ordered Hash in Ruby 1.9 was aliased as OrderedHash.
That way people who rely on preserving the insertion order in some application (me, for example) could explicitly use OrderedHash, and developers of Ruby would be free to redefine Hash in future versions if a better implementation that a doubly-linked circular list is found.
(I read something about a possibility of using "red���black tree".)

Thanks.

Alexey Muranov.


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