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Decorate methods on the class indicating that they should be used to validate fields
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:param each_item: for complex objects (sets, lists etc.) whether to validate individual elements rather than the
whole object
:param always: whether this method and other validators should be called even if the value is missing
:param check_fields: whether to check that the fields actually exist on the model
:param allow_reuse: whether to track and raise an error if another validator refers to the decorated function
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