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Format a kind to an output stream.
          Defined in header <boost/json/kind.hpp>
        
std::ostream& operator<<( std::ostream& os, kind k);
          This allows a kind to be formatted as a string,
          typically for diagnostics.
        
The output stream.
| Name | Description | 
|---|---|
| 
                     | The output stream to format to. | 
| 
                     | The kind to format. | 
          Convenience header <boost/json.hpp>