[issue46558] Quadratic time internal base conversions

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

Changed the code so that inner() only references one of the O(log log n) powers of 2 we actually precomputed (it could get lost before if `lo` was non-zero but within `n` had at least one leading zero bit - now we _pass_ the conceptual width instead of computing it on the fly).

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Added file: https://bugs.python.org/file50595/todecstr.py

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