[issue18430] gzip, bz2, lzma: peek advances file position of existing file object

[Nick Bargnesi]

Nick Bargnesi added the comment:

In that the underlying file position is not deterministic when used like this, I'm inclined to agree.

Though faced with documentation stating it does not "advance the file position", it certainly is less than explicit about it.

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<http://bugs.python.org/issue18430>
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