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add an example where the name of the enum is printed through a stream output function, which subverted the checkTransformer conversion and prevented conversion of the enumeration.
This PR deals with this situation for enumerations and other numeric types. It does it by discriminating between to_string situations in which a value is needed vs one where the converted string is needed, by adding a value_string overload which routes to the to_string unless the value is numeric or an enumeration.