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Functions to generate methods and pin them to the appropriate classes.
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Find the appropriate operation-wrappers to use when defining flex/special
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arithmetic, boolean, and comparison operations with the given class.
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Parameters
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----------
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cls : class
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Returns
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-------
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arith_flex : function or None
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comp_flex : function or None
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Adds the full suite of flex arithmetic methods (``pow``, ``mul``, ``add``)
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to the class.
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Parameters
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----------
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cls : class
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flex methods will be defined and pinned to this class
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