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Commonly useful converters.
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    A converter that allows an attribute to be optional. An optional attribute
    is one which can be set to ``None``.

    Type annotations will be inferred from the wrapped converter's, if it
    has any.

    :param callable converter: the converter that is used for non-``None``
        values.

    .. versionadded:: 17.1.0
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    A converter that allows to replace ``None`` values by *default* or the
    result of *factory*.

    :param default: Value to be used if ``None`` is passed. Passing an instance
       of `attrs.Factory` is supported, however the ``takes_self`` option
       is *not*.
    :param callable factory: A callable that takes no parameters whose result
       is used if ``None`` is passed.

    :raises TypeError: If **neither** *default* or *factory* is passed.
    :raises TypeError: If **both** *default* and *factory* are passed.
    :raises ValueError: If an instance of `attrs.Factory` is passed with
       ``takes_self=True``.

    .. versionadded:: 18.2.0
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    Convert "boolean" strings (e.g., from env. vars.) to real booleans.

    Values mapping to :code:`True`:

    - :code:`True`
    - :code:`"true"` / :code:`"t"`
    - :code:`"yes"` / :code:`"y"`
    - :code:`"on"`
    - :code:`"1"`
    - :code:`1`

    Values mapping to :code:`False`:

    - :code:`False`
    - :code:`"false"` / :code:`"f"`
    - :code:`"no"` / :code:`"n"`
    - :code:`"off"`
    - :code:`"0"`
    - :code:`0`

    :raises ValueError: for any other value.

    .. versionadded:: 21.3.0
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