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Re: [Extra] draft-ietf-extra-quota: 64 bit numbers

Bron Gondwana <brong@fastmailteam.com> Tue, 23 June 2020 11:37 UTC

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Date: Tue, 23 Jun 2020 21:37:19 +1000
From: Bron Gondwana <brong@fastmailteam.com>
To: extra@ietf.org
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Subject: Re: [Extra] draft-ietf-extra-quota: 64 bit numbers
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On Tue, Jun 23, 2020, at 20:20, Alexey Melnikov wrote:
> Hi Arnt,
> 
> On 22/06/2020 14:40, Arnt Gulbrandsen wrote:
> 
> > On Monday 22 June 2020 14:23:25 CEST, Timo Sirainen wrote:
> >> On 22. Jun 2020, at 15.11, Alexey Melnikov 
> >> <alexey.melnikov@isode.com> wrote:
> >>> On 17/06/2020 22:30, Timo Sirainen wrote:
> >>> ...
> >>
> >> Yes. I think this 63/64bit issue was discussed some time ago already. 
> >> Maybe related to some other extension.
> >
> > How about making ALL 32-bit numbers 63-bit in 4rev2? This may require 
> > nothing more than an entry in Appendix D.
> 
> My proposal for 64bit sizes everywhere 
> (https://datatracker.ietf.org/doc/draft-ietf-extra-imap-64bit/) got 
> rejected a few years back, partially due to reasons of backward 
> compatibility with IMAP4rev1. I don't think we are yet at the point 
> where we can just do this.
> 
> If we want to incorporate this now, I would like to see rather strong 
> support for this from this WG.

Just to summarise the reason it got rejected, it was something like "suppose you get something created by a V2 client which is larger than 32 bits - what does the v1 client see? The bigger item?, nothing?, a truncated version at 2^32-1?". The can has worms in it :(

Bron.

--
 Bron Gondwana, CEO, Fastmail Pty Ltd
 brong@fastmailteam.com

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