Great library, well written and documented. Great job.
You may not know, many people don't, and it's common usage to use _t as a suffix for types, but _t is reserved by posix.
I was calling all my types _t until I hit this page:
You could decide to ignore this and go on your merry way, or be compliant. I really don't think its a big deal either way. But, where there are standards, I think one should try to stick with the important ones, at least.