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      Without RTTI TypeIndex library will switch from using boost::typeindex::stl_type_index
      class to boost::typeindex::ctti_type_index. boost::typeindex::ctti_type_index
      uses macro for getting full text representation of function name for each type
      that is passed to type_id()
      and type_id_with_cvr()
      functions.
    
This leads to big strings in binary file:
static const char* boost::detail::ctti<T>::n() [with T = int] static const char* boost::detail::ctti<T>::n() [with T = user_defined_type]
While using RTTI, you'll get the following (more compact) string in binary file:
i 17user_defined_type