[issue22865] Document how to make pty.spawn not copy data

[Martin Panter]

Martin Panter <vadmium+py at gmail.com> added the comment:

I'm not sure it is wise for the Python documentation to suggest inserting null bytes in general. This seems more like an application-specific hack. There is nothing in Python that handles these null bytes specially, and I expect they will be seen if the child reads the terminal in raw mode, or if the parent's output is redirected to a file, sent over the network or a real serial link.

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