Tramticket, on 2018-September-26, 03:30, said:
Bidding 4♠ doesn't let the opponents define their hands. And if we want to bid to the level of fit, we surely have 10 trumps. I think that is is close between 3♠ and 4♠ and I may go all in, depending on my view of the opponents.
I thought about this too, but given that partner hasn't opened a weak two in second position, I erred slightly on the side of caution here. However, East has probably the best hand at the table and has used a support double which has some limitations as far as I can see. It guarantees 3 card
♥ support, but it doesn't say much else about East's HCP range. That's why I plumped for 3
♠ instead of 4
♠ here because the opponents are on real guess, as it's unlikely West has a six card
♥ suit as he didn't open a weak two in first position. 4
♠ I saw as a slight overbid, but as you say Tramticket it is borderline.