Comment 2 for bug 1237892

I've got a lead on a bit more of the core of the issue on this bug (vs. just a simple encode at the method call). This appears to be an issue in the cache key-generator when handling unicode strings, specifically in the stringificaiton (default) mechanism. I am working on a better stringification method for cache-key generation that will be unicode friendly. Once this new mechanism is implemented, use of the to_str argument on the @cache.on_arguments decorator will resolve the issue.