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Cache nil results for has_one associations so multiple calls don't call the database.  Closes #5757. [Michael A. Schoen]

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Deprecation: check whether instance variables have been monkeyed with before assigning them to deprecation proxies. Raises a RuntimeError if so.

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Fix Dispatcher.reset_application! so that AR subclasses are removed and Observers re-initialized *after* Reloadable classes are removed. Closes #5743.  [Rick Olson]

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Add support for the param_name parameter to the auto_complete_field helper. Fixes #5026 [david.a.williams@gmail.com]

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Add documentation for how to disable timestamps on a per model basis. Closes #5684. [matt@mattmargolis.net Marcel Molina Jr.]

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Deprecation! @session and @flash will be removed after 1.2. Use the session and flash methods instead. You'll get printed warnings during tests and logged warnings in dev mode when you access either instance variable directly.

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Tweak the Rails load order so observers are loaded after plugins, and reloaded in development mode. Closed #5279.  [Rick Olson]

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Refactor ActiveRecord::Base.reset_subclasses to #reset, and add global observer resetting.  [Rick Olson]

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Added that you can change the web server port in config/lighttpd.conf from script/server --port/-p (closes #5465) [mats@imediatec.co.uk]

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Added months and years to the resolution of DateHelper#distance_of_time_in_words, such that "60 days ago" becomes "2 months ago" (closes #5611) [pjhyett@gmail.com]

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script/performance/profiler compatibility with the new ruby-prof, including an option to choose the results printer. Closes #5679.

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