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      type_index is just a typedef
      for boost::typeindex::stl_type_index
      or boost::typeindex::ctti_type_index.
    
      Depending on the typeid()
      availability TypeIndex library will choose an optimal class for type_index. In cases when at least basic
      support for typeid()
      is available stl_type_index
      will be used.
    
      BOOST_TYPE_INDEX_REGISTER_CLASS
      macro is a helper macro that places some virtual helper functions or expands
      to nothing.
    
      BOOST_TYPE_INDEX_REGISTER_RUNTIME_CLASS
      macro is a helper macro that places the same helpers as BOOST_TYPE_INDEX_REGISTER_CLASS
      plus some additional helpers for boost::typeindex::runtime_cast to function.
    
Issues with cross module type comparison on a bugged compilers are bypassed by directly comparing strings with type (latest versions of those compilers resolved that issue using exactly the same approach).