That's wonderful!  An impressive extended core library.  Thanks a lot for
releasing that.  It's like receiving a new toy.

Now a few quick comments:

- Bigstring: I guess those are more for I/O.  The 16MB limit is not a
problem on 64-bit arhictectures.

- POLL and NODELAY in Linux_ext: that's very welcome.

- I guess JS isn't using Unicode.  After all, EBCDIC should be good enough
for stock tickers.  A Unicode library would have been nice - otherwise we
should complete the one in ExtLib.

- In tuple.ml, I find this worrying comment:

  The raison d'être for Space_safe_tuple<N> is that OCaml doesn't properly
  free variables matched in tuple patterns.

I didn't expect that, and that's quite annoying!  Shouldn't that be fixed in
the
Ocaml compiler?

- piecewise_linear.ml: I wonder what these are for.  Maybe for video games?

A very nice contribution to a "batteries included" standard library, indeed.
-- 
Berke Durak