Given a valid URL like https://example.com/article/id%3A1.2%2F1/bar, addressable's normalization replaces %3A with a literal :, and %2F with a literal /. Both of these replacements change the URL, meaning that requests for the URL may fail.

> Addressable::URI.normalized_encode("https://example.com/article/id%3A1.2%2F1/bar")
=> "https://example.com/article/id:1.2/1/bar"

Using URI#normalize has the same issue with %3A, but seems to preserve the %2F correctly:

> Addressable::URI.parse("https://example.com/article/id%3A1.2%2F1/bar").normalize.to_s
=> "https://example.com/article/id:1.2%2F1/bar"

My understanding of RFC3986 is that reserved characters (including : and /) should not be decoded during normalization.