The "will the 934 scheme ever really break" question really reduces to
"will there ever be nesting to a depth of approximately 35?
I doubt that this will be a common event, but I'm sure it will happen
eventually, especially if software that forwards, digests, rejects, or
otherwise transforms messages gets upgraded to do so in multipart
format. Therefore I prefer a scheme that will not break.
Ned seemed to imply that things might break sooner if the original
quoted line is long. This *might* be true, but probably it won't break
if there is already whitespace where the line can be wrapped "relatively
harmlessly". However, one can imagine a message with an 80 character
line beginning with a hyphen, in which wrapping is fatal. In such a
message, even a single level of quoting will break it. I worry more
about the deeply-nested case, however, because it strikes me as almost
inevitable. -- Nathaniel