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doctest.testmod() fails when attempting to echo back a bytes type with
ord() > 128.
def ok():
 """
>>> bytes([255,])
b'\xff'
"""
 pass
def notOK():
 """
>>> b'\xff'
"""
 pass
import doctest
doctest.testmod()
Traceback (most recent call last):
...
UnicodeEncodeError: 'ascii' codec can't encode character '\xff' in
position 141: ordinal not in range(128)