Re: [netmod] type equivalence

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Wed, 24 February 2021 20:39 UTC

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Date: Wed, 24 Feb 2021 21:39:15 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: netmod@ietf.org
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References: <20210222092455.qupjm2d4lpm4ay4n@anna.jacobs.jacobs-university.de> <20210222.104938.680142326480637892.id@4668.se> <20210222100857.ovetw7udo4ccbezx@anna.jacobs.jacobs-university.de> <20210222.111343.254950973345362316.id@4668.se> <04B94A94-236A-44CE-B47C-BE5F36FFF278@tzi.org> <20210222135333.t4hfa3ekguwm33pm@anna.jacobs.jacobs-university.de> <C83451C6-56D2-4A95-A0FE-66197E7DFB59@tzi.org> <20210222141715.vhzqka77yzhbkpst@anna.jacobs.jacobs-university.de> <450E683C-4F47-4314-BA63-DAC17AF60970@tzi.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/ZFuCVMeK03x3Gv14ZHCF6HL7Dz4>
Subject: Re: [netmod] type equivalence
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Here is an attempt to come up with better wording. If people agree on
a new wording, I volunteer to submit an errata.

OLD

   o  A "type" statement may be replaced with another "type" statement
      that does not change the syntax or semantics of the type.  For
      example, an inline type definition may be replaced with a typedef,
      but an int8 type cannot be replaced by an int16, since the syntax
      would change.

NEW

   o  A "type" statement may be replaced with another "type" statement
      that does not change the semantics of the type or the underlying
      built-in type.  For example, an inline type definition may be
      replaced with a semantically equivalent typedef derived from the
      same built-in type, but an int8 type cannot be replaced by an
      int16, since the underlying built-in type would change.

/js

On Mon, Feb 22, 2021 at 03:20:02PM +0100, Carsten Bormann wrote:
> On 2021-02-22, at 15:17, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> wrote:
> > 
> > I guess considering the built-in types as incompatible is the most
> > robust approach. If we agree that RFC 7950 tried to say this, we could
> > file an errata and propose clearer language.
> 
> Right.  And we can keep the COMI key-to-URL mapping as is, as this clarification is necessary for its correct functioning.
> 
> Grüße, Carsten
> 

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>