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

[Martin Panter]

Martin Panter added the comment:

Actually the “struct” module doc string seems to already hint that format strings can be byte strings:

“Python bytes objects are used to hold the data representing the C struct and also as format strings . . .”

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16349>
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