code: @SuppressWarnings("unchecked")
      private RequestCollapser<BatchReturnType, ResponseType, RequestArgumentType> getCollapserForUserRequest(HystrixCollapserBridge<BatchReturnType, ResponseType, RequestArgumentType> commandCollapser) {
          return (RequestCollapser<BatchReturnType, ResponseType, RequestArgumentType>) getRequestVariableForCommand(commandCollapser).get(concurrencyStrategy);
      }
docs: /* we are casting because the Map needs to be <?, ?> but we know it is <ReturnType, RequestArgumentType> for this thread