Incremental parsing and left folds

Johan Tibell wrote:

I initially used lazy I/O with lazy bytestrings in my web server but I'm changing that behvior to use left folds instead precisely because of the reasons you (and Oleg) mentioned. Unfortunately, that means I need a incremental Parsec for bytestrings (I think) so there's yet another library to write.

It wouldn't be hard to take bytestringparser and perform the same transformation on it as Adam Langley did with his IncrementalGet parser for strict-binary. I've been skipping it due to lack of time, but it's an obviously right thing to do.