Scoring: MP
Say you have a hand such as the above. After opening 1♦ and hearing 1♠ from pard, perhaps 2♠ is best. Any other call highly overstates your values, and there's a good chance the opps will let you bid again even if pard passes 2♠.
However, is 2♠ still right if RHO makes a 2♥ overcall? Unless pard is at least 5-5 in the majors, the opps have at least a 9-card heart fit. It's easy to construct hands where there's a double game -- or even slam -- swing, and surely you'll always bid at least 4♠ if 4♥ comes back to you.
After all that preamble, I'm suggesting that after 1♦ - P - 1♠ - 2♥, opener's jump to 4♠ should always show a hand of this type. With, say, 19 HCP and 4252 distribution, he needs to bid 3♥ at his second turn.
Agree?

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