Review all UTF-8 and alternative encodings stuff. See also: https://github.com/whatwg/url/commit/f7ab990492ff6f6f69b557b7693149f42bba6bd8 https://github.com/whatwg/url/commit/7659815b9fd0f26bf394e0c39cbc0eee2f6563e2 https://github.com/whatwg/url/commit/889793c8b1178a7c14c99e8e3183d642fd0293e3
