Previously, Routes used a ';' mark for an action in map.resource, like: /comments/4;preview
With 1.8, its now: /comments/4/previewRails made this 'fix' quite awhile ago, and its been late coming to Routes.
The other change that might break some apps is that Routes no longer double escapes the already escaped URL. I know some people have workarounds in their code to handle this, which will need to be removed after upgrading.
Cheers, Ben
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