Spring Make StompSession.Subscription.unsubscribe() to return Receiptable

When I use WebSocketStompClient, then StompSession.subscribe method returns Subscription which extends Receiptable. The StompSession.send is also returns Receiptable.

This allows to call Receiptable.getReceiptId(), Receiptable.addReceiptTask(Runnable runnable) and Receiptable.addReceiptLostTask(Runnable runnable). These methods is useful to for example do send only when subscription is already created by broker (and not just called on client side).

But StompSession.Subscription.unsubscribe() method returns void. It also doesn't send receipt STOMP header even when StompSession.setAutoReceipt(true).

This prevents to check if unsubscription is already done on broker side (by waiting RECEIPT frame after UNSUBSCRIBE was sent).

It would be useful if StompSession.Subscription.unsubscribe() and StompSession.Subscription.unsubscribe(StompHeaders headers) will return Receiptable instead of void. It can also use StompSession.autoReceipt flag to automatically add a receipt header, as other methods do.