code: public Object get(IConverter converter, Object sourceObject,
  			TypeReference<?> destinationType) {
  		return convertedObjects.get(new ConvertedObjectsKey(converter,
  				sourceObject, destinationType));
  	}
docs: get the converted object corresponding to sourceObject as converted to
  destination type by converter
  
  @param converter
  @param sourceObject
  @param destinationType
  @return