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