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Commonly useful converters.
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    A converter that allows an attribute to be optional. An optional attribute
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    A converter that allows to replace ``None`` values by *default* or the
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    :param callable factory: A callable that takes no parameters whose result
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    :raises TypeError: If **neither** *default* or *factory* is passed.
    :raises TypeError: If **both** *default* and *factory* are passed.
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