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        Determine a value
        can be converted to T.
      
        Defined in header <boost/json/value_to.hpp>
      
template< class T> using has_value_to = see-below;
        If value
        can be converted to T via
        a call to value_to,
        the static data member value
        is defined as true. Otherwise,
        value is defined as false.
      
        Convenience header <boost/json.hpp>