New submission from Marcel Martin <pyt...@marcelm.net>:

It would be great to be able to use peek() on BytesIO objects.

I have a function that gets passed a file-like object and uses peek() on it. 
This works for nearly all types of files relevant in my library, except BytesIO 
instances (which I use during testing), for which I need to add a small 
workaround using tell() and seek().

----------
components: Library (Lib)
messages: 410552
nosy: marcelm
priority: normal
severity: normal
status: open
title: io.BytesIO does not have peek()
type: enhancement
versions: Python 3.11

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46375>
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