cherdano, on 2016-November-14, 09:46, said:
I think double by East is just descriptive, showing a very strong 2NT overcall. It mostly says "we probably make 4H if you have a decent fit, and perhaps 5D if you have a good fit and one useful card". Getting a penalty against a freely bid 3NT is a secondary concern when you are 5-5.
This makes bidding with West even clearer, even if you think double doesn't show quite as much. (West's hand would be even stronger if East had a doubleton in clubs instead of spades.)
But it also makes me think that West's pass should be forcing - presumably with some interest in doubling 4 clubs, rather than bidding on. Which doesn't make passing on West's actual cards any more convincing, but doesn't exonerate East either.