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Description
This is also related to #4574 -- and we should make sure to do this and that in the same release.
We currently have a fair amount of (some of it slowish) code to support canonifyURLs, and there are several issues with it. Issues that are very hard to fix in a simple way. I don't use canonifyURLs, and I'm not willing to spend time fixing/maintaining it.
So until someone steps up to the plate with some magic, we are removing it.
/cc @spf13