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cB@sKeZ
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    important tips regarding treatment of NULL values and ORM use.

    .. versionchanged:: 1.1 :class:`.postgresql.JSON` is now a PostgreSQL-
       specific specialization of the new :class:`.types.JSON` type.

    The operators provided by the PostgreSQL version of :class:`.JSON`
    include:

    * Index operations (the ``->`` operator)::

        data_table.c.data['some key']

        data_table.c.data[5]


    * Index operations returning text (the ``->>`` operator)::

        data_table.c.data['some key'].astext == 'some value'

    * Index operations with CAST
      (equivalent to ``CAST(col ->> ['some key'] AS <type>)``)::

        data_table.c.data['some key'].astext.cast(Integer) == 5

    * Path index operations (the ``#>`` operator)::

        data_table.c.data[('key_1', 'key_2', 5, ..., 'key_n')]

    * Path index operations returning text (the ``#>>`` operator)::

        data_table.c.data[('key_1', 'key_2', 5, ..., 'key_n')].astext == 'some value'

    .. versionchanged:: 1.1  The :meth:`.ColumnElement.cast` operator on
       JSON objects now requires that the :attr:`.JSON.Comparator.astext`
       modifier be called explicitly, if the cast works only from a textual
       string.

    Index operations return an expression object whose type defaults to
    :class:`.JSON` by default, so that further JSON-oriented instructions
    may be called upon the result type.

    Custom serializers and deserializers are specified at the dialect level,
    that is using :func:`.create_engine`.  The reason for this is that when
    using psycopg2, the DBAPI only allows serializers at the per-cursor
    or per-connection level.   E.g.::

        engine = create_engine("postgresql://scott:tiger@localhost/test",
                                json_serializer=my_serialize_fn,
                                json_deserializer=my_deserialize_fn
                        )

    When using the psycopg2 dialect, the json_deserializer is registered
    against the database using ``psycopg2.extras.register_default_json``.

    .. seealso::

        :class:`.types.JSON` - Core level JSON type

        :class:`.JSONB`

    cC@s5tt
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        :param none_as_null: if True, persist the value ``None`` as a
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         when this flag is False, the :func:`.null` construct can still
         be used to persist a NULL value::

             from sqlalchemy import null
             conn.execute(table.insert(), data=null())

         .. versionchanged:: 0.9.8 - Added ``none_as_null``, and :func:`.null`
            is now supported in order to persist a NULL value.

         .. seealso::

              :attr:`.JSON.NULL`

        :param astext_type: the type to use for the
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         accessor on indexed attributes.  Defaults to :class:`.types.Text`.

         .. versionadded:: 1.1

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On an indexed expression, use the "astext" (e.g. "->>")
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            .. seealso::

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d��YZeZRS(s_Represent the PostgreSQL JSONB type.

    The :class:`.JSONB` type stores arbitrary JSONB format data, e.g.::

        data_table = Table('data_table', metadata,
            Column('id', Integer, primary_key=True),
            Column('data', JSONB)
        )

        with engine.connect() as conn:
            conn.execute(
                data_table.insert(),
                data = {"key1": "value1", "key2": "value2"}
            )

    The :class:`.JSONB` type includes all operations provided by
    :class:`.JSON`, including the same behaviors for indexing operations.
    It also adds additional operators specific to JSONB, including
    :meth:`.JSONB.Comparator.has_key`, :meth:`.JSONB.Comparator.has_all`,
    :meth:`.JSONB.Comparator.has_any`, :meth:`.JSONB.Comparator.contains`,
    and :meth:`.JSONB.Comparator.contained_by`.

    Like the :class:`.JSON` type, the :class:`.JSONB` type does not detect
    in-place changes when used with the ORM, unless the
    :mod:`sqlalchemy.ext.mutable` extension is used.

    Custom serializers and deserializers
    are shared with the :class:`.JSON` class, using the ``json_serializer``
    and ``json_deserializer`` keyword arguments.  These must be specified
    at the dialect level using :func:`.create_engine`.  When using
    psycopg2, the serializers are associated with the jsonb type using
    ``psycopg2.extras.register_default_jsonb`` on a per-connection basis,
    in the same way that ``psycopg2.extras.register_default_json`` is used
    to register these handlers with the json type.

    .. versionadded:: 0.9.7

    .. seealso::

        :class:`.JSON`

    RR!c
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