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([2a01:e34:ec4e:5670:9040:d90a:f8eb:8112]) by smtp.googlemail.com with ESMTPSA id k22-20020a05600c0b5600b003f40049a65bsm5360043wmr.21.2023.05.04.20.37.26 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 May 2023 20:37:26 -0700 (PDT) Message-ID: <8233a692-df84-f093-96bf-fe99c03adfc5@gmail.com> Date: Fri, 5 May 2023 05:37:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Content-Language: en-US To: "cbor@ietf.org" From: Anders Rundgren Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: [Cbor] Status of Appendix A in RFC 8949 X-BeenThere: cbor@ietf.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: "Concise Binary Object Representation \(CBOR\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 May 2023 03:37:33 -0000 Hi CBOR WG, In https://www.rfc-editor.org/rfc/rfc8949.html#name-examples-of-encoded-cbor-da there is a table with some example values given in Diagnostic Notation and how they are to be encoded in CBOR. A problem with this is that the appendix is not marked as "non-normative" although it it is (apparently...) based on Rule 2 in section 4.2.2. Why is that a problem? Well, in https://www.ietf.org/archive/id/draft-mcnally-deterministic-cbor-01.html#name-reduction-of-floating-point Rule 1 is (apparently...) applied, which means that "-4.0" would return 0x23 rather than 0xf9c400 proposed in Appendix A as well as by Carsten's CBOR playground (https://cbor.me/). Taking CBOR to the world of shrink-wrapped software comparable to Open API will undoubtedly require a CBOR interoperability profile. In such a profile, deterministic encoding is a side effect. Thanx, Anders