You are South in the auction below:

How should you take partner’s 2 NT bid?
You are South again in a very similar auction:

Now what do you make of partner’s double?
You are South in the auction below:
How should you take partner’s 2 NT bid?
You are South again in a very similar auction:
Now what do you make of partner’s double?
If I were the 2nt or double bidder I would be asking my partner to bid the better of his two red suits.
The point is that these are two different bids–they should have different meanings.
negative double for hearts
2Nt is not any sort of “double”. And negative double is a bid that applies when partner has opened. That is not the case here.