"v=1" doesn't have to come first. It just usually does. I think there was
a version of RFC4871 that did that, but then when challenged we couldn't
come up with a good reason to keep it that way.
Heh. I'm still waiting to hear a good reason as to why "v=" exists at all -
from exposing brittle parsers which mistakenly expect it to show up as the first
It's about as likely to change as "MIME-Version: 1.0", which is to say, never.
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