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Second question:
The following looks as if a BOM might be written for writeable, non-seekable streams:
 # don't write a BOM in the middle of a file
 if self._seekable and self.writable():
 position = self.buffer.tell()
 if position != 0:
 try:
 self._get_encoder().setstate(0)
 except LookupError:
 # Sometimes the encoder doesn't exist
 pass
Is that really desirable? It seems to me the safe choice is to *not* write the BOM, except when we know it's safe. Eg:
 # don't write a BOM unless we know we're at the beginning of a file
 if (self.writeable() and not
 (self._seekable and self.buffer.tell() == 0)):
 try:
 self._get_encoder().setstate(0)
 except LookupError:
 # Sometimes the encoder doesn't exist
 pass