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The digit 1 is zero, and each leading 1 is already a zero byte. Packing the leftover 0 added one extra byte, so '1' decoded as two zero bytes.
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Summary
b58decode('1')returned two zero bytes. The digit 1 is zero, and each leading 1 is already a zero byte, so packing the leftover 0 added one extra.b58decode('11')is now two zero bytes.b58decode('2')is stillb'\x01'.b58decode('')is now empty.validate('1NEDqZPvTWRaoho48qXuLLsrYomMXPABfD')is still that address.validate('1111111111111111111114oLvT2')is still that address.Test plan
pytest --doctest-modules stdnum/bitcoin.py tests/test_bitcoin.doctest