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        >>> list(always_iterable(obj))
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        >>> obj = None
        >>> list(always_iterable(None))
        []

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        ['foo']

    If *base_type* is set, objects for which ``isinstance(obj, base_type)``
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        >>> obj = {'a': 1}
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        ['a']
        >>> list(always_iterable(obj, base_type=dict))  # Treat dicts as a unit
        [{'a': 1}]

    Set *base_type* to ``None`` to avoid any special handling and treat objects
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