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In http://url.spec.whatwg.org/#parsing authority state [[ If c is one of EOF code point, "/", "\", "?", and "#", ]] This must be [[ Otherwise, if c is one of EOF code point, "/", "\", "?", and "#", ]] otherwise it wrongly append c (@) to buffer.
https://github.com/whatwg/url/commit/852809fa41a79601d60d3c3c0f180551dfa43af5