Slug header encoding

[asakura@xxxxxxxx]

Does anyone implement Slug header encoding (RFC2047)?
In implementers' community, it seems to be unwelcome specificaiton.
Because it requires paying attention to folding and linear-white-space.
In fact, I hear that many Japanese MUA doesn't keep RFC2047 in detail.

We, using non-ascii code people, want to use easier encoding method.
For example, IRI use UTF-8 based encoding method, it seems to be
simple.
And UTF-8 is adopted for I18N at many working group of IETF such as
SIP working group(SIP protocol), MMUSIC WG(SDP format) etc.

I would like to also adopt UTF-8 based encoding for Slug header.
Sorry, but I can't propose other method now. maybe IRI's is good.