code: function(value) {
          switch (values.typeOf(value)) {
              case 'Null':
                  return 'null';
  
              case 'Boolean':
              case 'Number':
              case 'RegExp':
                  return String(value);
  
              case 'String':
                  return value;
  
              case 'Date':
              case 'Duration':
                  return value.valueOf();
  
              case 'Filter':
                  return value.source;
  
              case 'Array':
              case 'Object':
                  return values.inspect(value);
          }
      }
docs: Returns string representation of a Juttle value. This representation is intended to be used in places where readability has precedence over exactness (e.g. gadgets, charts).  See also values.inspect.