Feature #994: Hash-order preservation should be declared a feature; documentation needs to be adapted
http://redmine.ruby-lang.org/issues/show/994

Author: Joachim Wuttke
Status: Open, Priority: Normal

I would like to come back to a thread from March 2008 in comp.lang.ruby,
http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/5803482840ed66ca/7af75e86b1975224?hl=enaf75e86b1975224:

For me, hash order preservation is an important advantage of Ruby 1.9; it allows me to generate human-readable YAML output without ugly workarounds.

Matz said, it is now a guaranteed feature of CRuby; but at that time he was still cautious regarding Ruby-the-language. Maybe time has come to establish a consensus and to take a decision. It would give me security for the future of my code base.

Once hash-order preservation is declared a feature, the following text in ri1.9 needs to be adapted:
  "The order in which you traverse a hash by either key or value may seem arbitrary, and will generally not be in the insertion order."


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