[issue39803] _PyLong_FormatAdvancedWriter has an unnecessary str

[Andy Lester]

Change by Andy Lester <andy at petdance.com>:


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pull_requests: +18067
pull_request: https://github.com/python/cpython/pull/18708

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39803>
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