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Register conversion support between `ipaddress` objects and `network types`__.
:param conn_or_curs: the scope where to register the type casters.
If `!None` register them globally.
After the function is called, PostgreSQL :sql:`inet` values will be
converted into `~ipaddress.IPv4Interface` or `~ipaddress.IPv6Interface`
objects, :sql:`cidr` values into into `~ipaddress.IPv4Network` or
`~ipaddress.IPv6Network`.
.. __: https://www.postgresql.org/docs/current/static/datatype-net-types.html
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