Tim Peters <t...@python.org> added the comment:

This is a stab at reducing overhead for small exponents, along the lines I 
sketched:

https://github.com/python/cpython/pull/26662

Unfortunately, I've been unable to convince BPO and GitHub to recognize that 
the PR is related to this report. Did something basic change?

Incidentally, at first this change triggered rare shutdown deaths due to 
negative refcounts, in the collection of small integer objects. That was a 
head-scratcher! Turns that was, I believe, due to a "temp = NULL" line missing 
from earlier code introduced to implement powers of modular inverses.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44376>
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