Why size_t ?

I don't understand why you chose to use `size_t` in your framework and not more common type, such as `NSUInteger`.

Maybe the number of bytes is not the same?

Anyway, isn't it a bad choice? Indeed, your library is _de facto_ a wrapper for `CFPDFDocumentRef` and should, IMHO, use common types.

For instance, when I see `size_t`, I don't understand. `NSUInteger` is much more Objective-C-friendly.