Red-Black Trees are now used for duplicate detection, and planned

to be used for unordered map storage. This is because AAs still
don't work correctly and even if they did, require the user to
define both toHash and opCmp/opEquals for every YAML
struct/class. Now only opCmp needs to be defined.
Documentation/tutorials/examples have been updated accordingly.

doc/html/tutorials/yaml_syntax.html

@@ -330,7 +330,7 @@ Some of these might change in the future (especially !!map and !!set).</p>
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         &copy; Copyright 2011, Ferdinand Majerech. Based on PyYAML http://www.pyyaml.org by Kirill Simonov.
-      Last updated on Nov 18, 2011.
+      Last updated on Jan 23, 2012.
       Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.7.
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