The OCaml compiler has a bunch of intrinsics for Bigstrings, but they're not
widely-known, sometimes misused, and programs that use Bigstrings are slower
than they have to be. And even if a library got that part right and exposed the
intrinsics properly, the compiler doesn't have any fast blits between Bigstrings
and other string-like types.

This library implements them.

Homepage:
https://github.com/inhabitedtype/bigstringaf/
