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Ruby 1.9

The document summarizes changes between Ruby 1.8 and Ruby 1.9. Key changes include ordered hashes, new hash syntax, external iterators using Enumerators, better encoding support through M17N, and changes to the threading model. The document provides an overview of Ruby 1.8 vs 1.9 and dives into specific changes like new syntax, library changes, and new features in Ruby 1.9 like external iterators and improved internationalization support.

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