[issue1267] Py3K cannot run as ``python -S``

[Brett Cannon]

Brett Cannon added the comment:

OK, for some reason, when PyTokenizer_FindEncoding() is called and the
resulting file is big enough, it starts off with a seek position
(according to TextIOWrapper.tell()) of 4096.  That happens to be exactly
half the size of the buffer used by io.

But I am not sure what the magical size is as creating a file of 4095,
4096, and 4097 bytes does not trigger this bug.

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