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[Cbor] Re: List of all serialization variation (was Re: Working Group Last Call on Serialization draft)

Laurence Lundblade <lgl@island-resort.com> Fri, 04 September 2026 19:48 UTC

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From: Laurence Lundblade <lgl@island-resort.com>
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Date: Fri, 04 Sep 2026 12:48:32 -0700
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To: Joe Hildebrand <hildjj@cursive.net>
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CC: Barry Leiba <barryleiba@gmail.com>, CBOR Working Group <cbor@ietf.org>
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Subject: [Cbor] Re: List of all serialization variation (was Re: Working Group Last Call on Serialization draft)
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Ahh yes, Unicode should be mentioned.

This has prompted me to rework Appendix B to be a list of things other than serialization needed for full determinism:
 - Data model
 - Unicode
 - Tags

See 

https://github.com/cbor-wg/draft-ietf-cbor-serialization/pull/85
Rework full protocol determinism appendix by laurencelundblade · Pull Request #85 · cbor-wg/draft-ietf-cbor-serialization
github.com





> On Sep 3, 2026, at 10:24 AM, Joe Hildebrand <hildjj@cursive.net> wrote:
> 
> I was thinking about Unicode normalization forms, but maybe there's something else?
> 
> — 
> Joe Hildebrand
> 
>> On Sep 3, 2026, at 10:57 AM, Laurence Lundblade <lgl@island-resort.com> wrote:
>> 
>> Appreciate the thorough review!
>> 
>>> On Aug 18, 2026, at 12:05 PM, Joe Hildebrand <hildjj@cursive.net> wrote:
>>> 
>>> s2.1.1: I suggest "it may mandate deterministic serialization for all implementations in order to eliminate all serialization variability" -> "it may mandate deterministic serialization for all implementations in order to minimize serialization variability", since there are other sources of serialization variability.
>> 
>> 
>> I can’t think of any other sources of serialization variability. Seems important to be sure we got themm all. They are listed in the description of [General Serialization]. Map sort ordering is missing, but I will add it [PR-unordered]. Am I missing something?
>> 
>> - map sorting
>> - def/indef lengths
>> - CBOR argument length
>> - float length
>> 
>> 
>> There is variability at the data model level that needs to be addressed for full determinism of a protocol, but that is not serialization variation.
>> 
>> LL
>> 
>> 
>> [General Serialization]: https://www.ietf.org/archive/id/draft-ietf-cbor-serialization-08.html#name-general-serialization
>> [PR-unordered: https://github.com/cbor-wg/draft-ietf-cbor-serialization/pull/84/changes
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>

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