Something strange with exotic text

Hello !

I was testing how utf8 works on my forum, then posted all this text :
http://tinypaste.com/f972e247 (taken from http://www.columbia.edu/~fdc/utf8/)

PunBB shows an error (debugging message) and saves only part of the text. Same problem here on official punbb.org (http://punbb.informer.com/forums/post/143130/#p143130) : saving process stops at Gothic (4):, although preview was showing complete text ; should be something wrong somewhere.

Probably nothing important, though worth mentioning.