These images are worth a thousand words; red is the code that produces the corresponding orange output:

These numbers... and I'm not in the mood to dive into the ZF2 source tonight ;)

Moreover, the workaround seems to be two consecutive write()s (or one long write()). I see it happening pretty much everywhere where the strings are too long, although it doesn't occur often enough for me to replace all of my writeLine()s with consecutive write()s.

Latest Debian Linux using the default console adapter shipped w/ ZF2.