MBStrings question for in PEAR::Mail_Mime

Hello all,

My name is Cipriano Groenendal, and I'm the maintainer for pear.php.net's 
Mail_Mime package. I'm trying to make the mails generated by this package 
compatible with non ISO-8869-1 charsets, but I ran into a small problem.
The current code I'm using is not multi-bytecompatible, so I was wanting to 
use the mb_encode_mimeheader function to do this for me instead.
However, upon reading the documentation, I noticed a lot of people had 
posted comments about the buggyness and instability of this function, so I 
was wondering if anyone could shed some light on this, and maybe know up to 
which version what bugs were there, so I can work around those and provide 
everyone with a good working version of Mail_Mime that can send in more then 
just singlebyte charsets :)

Thanks in advance,
Cipri