[issue16349] Document whether it's safe to use bytes for struct format string

[Terry J. Reedy]

Terry J. Reedy added the comment:

For 3.3, I verified that adding b prefix to first three doc examples gives same output as without, but also discovered that example outputs are wrong, at least on windows, because of byte ordering issues.

>>> pack('hhl', 1, 2, 3)
b'\x01\x00\x02\x00\x03\x00\x00\x00'
>>> pack(b'hhl', 1, 2, 3)
b'\x01\x00\x02\x00\x03\x00\x00\x00'
>>> unpack(b'hhl', b'\x00\x01\x00\x02\x00\x00\x00\x03')
(256, 512, 50331648)
>>> unpack('hhl', b'\x00\x01\x00\x02\x00\x00\x00\x03')
(256, 512, 50331648)

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nosy: +mark.dickinson, meador.inge, terry.reedy

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<http://bugs.python.org/issue16349>
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