I'm not sure what my opinion is on that last point, but on the first
point I think it's best to define an identifier that's specifically
for ADSP's use, if we want that function. Some signers may give that
tag the same value they give i=, and there's no harm done. Some
signers may use a different value, which would demonstrate the wisdom
of separating them.
Seems like a reasonable way to avoid the i= fight. If there's interest,
I can whip up a new ADSP draft with an r= tag.
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