Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

This was an intentional decision.  Deques designed for fast access at the end 
points. Also, pop() is a core deque operation that needs to be fast.  Altering 
its signature with an optional argument would slow it down.

Thank you for the suggestion, but we really shouldn't do this.

----------
resolution:  -> rejected
stage:  -> resolved
status: open -> closed
versions: +Python 3.10

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41409>
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