* Add more tests
* Refactor and neaten the code a bit.
* Rename union_update() to update().
* Improve the algorithms (making them a closer to sets.py).

guess_all_extensions() returns (at least) what we expect.  As Jeff
Epler suggests in

http://mail.python.org/pipermail/python-dev/2003-September/038264.html

We use a set to test the results.  This fixes the test when
test_urllib2 is run before test_mimetypes.

  function.

* Add a better test for deepcopying.

* Add tests to show the __init__() function works like it does for list
  and tuple.  Add related test.

* Have shallow copies of frozensets return self.  Add related test.

* Have frozenset(f) return f if f is already a frozenset. Add related test.

* Beefed-up some existing tests.

  by the function object or by the method object, the function
  object's attribute usually wins.  Christian Tismer pointed out that
  that this is really a mistake, because this only happens for special
  methods (like __reduce__) where the method object's version is
  really more appropriate than the function's attribute.  So from now
  on, all method attributes will have precedence over function
  attributes with the same name.

Brings the functionality back in line with sets.py.

dangers of trying to iterate over weak dicts.

(Requested by Alex Martelli.)

* Improve the hash function to increase the chance that distinct sets will
  have distinct xor'd hash totals.

* Use PyDict_Merge where possible (it is faster than an equivalent iter/set
  pair).

* Don't rebuild dictionaries where the input already has one.

Also SF patch 843455.

This is a critical bugfix.
I'll backport to 2.3 maint, but not beyond that.  The bugs this fixes
have been there since weakrefs were introduced.

from the OS9 readme that is still relevant.
Got rid of Distributions/readme.txt.

Cleaned up various things in the toolbox modules.

to pymactoolbox.h (where it should have been in the first place).

MacOS9isms.

later.

pre-carbon MacOS9 support.

and the biggest in size, but probably the easiest. Hunting through the
source code comes next.