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:mod:`ipaddress` module no longer accepts any leading zeros in IPv4 address
strings. Leading zeros are ambiguous and interpreted as octal notation by
some libraries. For example the legacy function :func:`socket.inet_aton`
treats leading zeros as octal notation. glibc implementation of modern
:func:`~socket.inet_pton` does not accept any leading zeros. For a while
the :mod:`ipaddress` module used to accept ambiguous leading zeros.
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