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@xl_arg and @xl_return Decorators ¶ The final way type information can be added to a function is by using specific argument and return type decorators. These are particularly useful for more complex types that require parameters, such as NumPy arrays and Pandas types.
If return_type is set to values, a pandas Series will be returned with only the valid strings. Note: Prior to version 0.5.0, some non-string data types were automatically converted to strings before the validation.
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