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+* Accessing mime types via constants like `Mime::HTML` is deprecated. Please
+ change code like this:
+
+ Mime::HTML
+
+ To this:
+
+ Mime::Type[:HTML]
+
+ This change is so that Rails will not manage a list of constants, and fixes
+ an issue where if a type isn't registered you could possibly get the wrong
+ object.
+
* `url_for` does not modify its arguments when generating polymorphic URLs.
*Bernerd Schaefer*