swig/python detected a memory leak... no destructor found - for enums!

Question

This is about embedded python using swig.

I have an std::map exposed to python (embedded python). When the script is executed, swig spits out the below "warning" at the end (when the map goes out of scope - I guess):

swig/python detected a memory leak of type 'std::map< MyEnum, std::string> ... no destructor found

The .i file is:

enum MyEnum {
 ...
};

typedef std::map<MyEnum, std::string>  MyTypedef;
%template(MyTypedef) std::map<MyEnum, std::string>;

Things are ok if I replace MyEnum with int all over the code. Don't know why swig needs any special destruction when enums are not PyObjects! Am I missing something? Is there some %magic_operator which will help. Note: I do not want to suppress the "memory leak" warning all together.

Took a hard look at the wrapper generated by swig but in vain.