Sieve and encoded Headers

[Garry]

Hi,

after wondering for a while why occasionally my sieve script rules
wouldn't work, I just found the reason (I guess) - Sieve doesn't
(correctly?) decode utf encoded header lines which e.g. are in a format
like this:

Subject: =?utf-8?B?W0xPR10gV2F0Y2hsaXN0OiBzbWVhZ29sIGZvdW5kIEdydcOfIGF1cyBkZXIgVW50ZXJ3ZWx0IChVbmtub3duIENhY2hlKQ==?=


I'm using version: "Cyrus timsieved v2.2.13-Debian-2.2.13-19" ... is it
something that is fixed in a newer version? I tried finding something on
the net, but at least the first couple of results pages didn't yield any
insight ...

Tnx, garry