Computer generated fun hands! I have a few boards I need to review, here’s one that was memorable.
I liked my choice of 1♠ and all was going well until my partner wanted to be in slam.
We have no agreement here over interference, what do you do?
What should I add to deal with this in future? D0P1 seems to be simplest and least likely for me to forget when this comes up again after another 300 hands.

Help

(P) 1♠ (P) 2♥
(P) 4♥ (P) 4nt
(5♣) ?