code: public boolean isConsistent(Storable reference, S master) throws FetchException {
          try {
              return (Boolean) mIsConsistentMethod.invoke(reference, master);
          } catch (Exception e) {
              ThrowUnchecked.fireFirstDeclaredCause(e, FetchException.class);
              // Not reached.
              return false;
          }
      }
docs: Returns true if the properties of the given reference match those
  contained in the master, excluding any version property. This will
  always return true after a call to copyFromMaster.
  
  @param reference reference whose properties will be tested
  @param master source of property values