docs: private FieldConversion[] getPkFieldConversion(ClassDescriptor cld)
      {
          FieldDescriptor[] pks = cld.getPkFields();
          FieldConversion[] fc = new FieldConversion[pks.length]; 
          
          for (int i= 0; i < pks.length; i++)
          {
              fc[i] = pks[i].getFieldConversion();
          }
          
          return fc;
      }