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Base class for extension arrays implementing string methods.
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This is where our ExtensionArrays can override the implementation of
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Series.str.<method>. We don't expect this to work with
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3rd-party extension arrays.
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* User calls Series.str.<method>
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* pandas extracts the extension array from the Series
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* pandas calls ``extension_array._str_<method>(*args, **kwargs)``
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* pandas wraps the result, to return to the user.
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See :ref:`Series.str` for the docstring of each method.
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