Bron,
From my recollection, your theory on why colon was used as a separator
is correct.
-Jim
On 20 Nov 2025, at 19:46, Bron Gondwana wrote:
Hi All,
Hopefully the collective memory of this group can answer me the
question: why was colon chosen as the separator for the h= value?
Even as I type the question I suspect it's because "header field" has
a quite permissive ABNF and colon is for sure not permitted since it's
the separator!
Anyways, I'm considering updating Message-Instance to use colon as the
separator for the b and h.header values as well, so the format is more
regular and more easily parsed.
...
In other open questions; whether Message-Instance should sign all
headers or just a named list. I've heard strong arguments for both,
and I expect to dedicate time in our next interim to discussing them.
And finally, should we be using relaxed/strict (relaxed for the
header, strict for the body) in Message-Instance? This aligns better
with the oblivious signatures work, allowing the same normalisations
for both. Relaxed for the body allows for more shenanigans around
significant whitespace (particularly the '-- ' signature separator,
and format=flowed parts), which is an argument against it.
Bron.
--
Bron Gondwana, CEO, Fastmail Pty Ltd / Fastmail US LLC
[email protected]
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