I'd prefer if Yarn continued to always prompt.
For instance, some people (I guess enamored of their spanking new
Mail software and its profusion of buttons) will post a follow-on
as a MIME multi-part message (their answer is one part; they copy
the original [what they are responding to] into another part).
Now, when such a message goes through metamail, etc., it shows me
the parts sequentially (i.e., I can't go back and forth between
the body parts). But if I reply 'no' at the prompt, and view the
message with Yarn, it's treated as just one long text file, which
I can page up/down freely. [Besides, I've set up Yarn colors the
way I like them; my metamail/viewers are pale by comparison.]
Chin, please consider this extension to Yarn:
If the charset= in the header is something Yarn does not recognize
(e.g., 'unknown' or 'big-5' or 'koi-8'), PLEASE scan the message
text for code points above 127. If you find any, go through the
MIME prompt that you do today. BUT, if there are *NO* code points
above 127, please treat the message as though 'charset=' had been
omitted -- this will avoid a large number of MIME prompts by Yarn.
mikus