RSS URLs with sharp (%23) don't work when added

Consider a URL such as http://stackoverflow.com/feeds/tag/c%…

When added it is treated as http://stackoverflow.com/feeds/tag/c# and fetches the feed at http://stackoverflow.com/feeds/tag/c (which happens to be a valid, but different, feed).

If I go into site settings and edit the URL back from # to %23 then I get the right feed.

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