TODO in tulip v2 (tulip/ package directory)
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- See also TBD and Open Issues in PEP 3156

- Refactor unix_events.py (it's getting too long)

- Docstrings

- Unittests

- better run_once() behavior?  (Run ready list last.)

- start_serving()

- Make Handler() callable?  Log the exception in there?

- Add the repeat interval to the Handler class?

- Recognize Handler passed to add_reader(), call_soon(), etc.?

- SSL support

- buffered stream implementation

- Primitives like par() and wait_one()

- Remove test dependency on xkcd.com, write our own test server
