Sometimes an exception, that should be re-cast, would get gobbled up if
it could be interpreted as a "connection broken" exception

satella .select() could return with UnboundLocalError due to processing
resuming on error

satella by default uses poll() in event dispatch. Fallback to select()
will be done on platforms that don't support poll()

superficial

Learned the hard way, sadly.

1) If input data contains heavy Unicode, export() will not fail.
2) Exported string will be reliably a str, UTF-8 encoded

see https://bugs.pypy.org/issue1255 for details