docs: private FieldTextBuilder binaryOp(final String operator, final FieldTextBuilder fieldText) {
          // Special case when we're empty
          if(componentCount == 0) {
              // Just copy the argument
              fieldTextString.append(fieldText.fieldTextString);
              lastOperator = fieldText.lastOperator;
              not = fieldText.not;
              componentCount = fieldText.componentCount;
          } else {
              // Add the NOTs, parentheses and operator
              addOperator(operator);
  
              if(fieldText.lastOperator == null || fieldText.lastOperator.equals(operator) || fieldText.not) {
                  fieldTextString.append(fieldText.toString());
              } else {
                  fieldTextString.append('(').append(fieldText.toString()).append(')');
              }
  
              componentCount += fieldText.size();
              not = false;
          }
  
          return this;
      }