testing signed version of custom int writer; it does appear to be a few percent faster (~5%); I'm not completely sure why... idiv should be faster than div on all intels I've ever seen, need to grab a disassembly
figured out why signed is faster for us w.r.t. #39
delete old CustomWriteIntUnroll; fix a bug in new CustomWriteIntUnrollSigned
try extending the same thing to uints; there are a couple different ways to do this, this one doesn't work (ie. is the same or slower)
and here's another way, which is much worse
nuke failed uint stuff; cleanup some names