[issue36027] Support negative exponents in pow() where a modulus is specified.

[Mark Dickinson]

Change by Mark Dickinson <dickinsm at gmail.com>:


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pull_requests: +25287
pull_request: https://github.com/python/cpython/pull/26703

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36027>
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