On the implementation of the formula for calculating D

[exp-euler]

Hi,

I'm not entirely sure, but I think there might be an issue with how Ann is defined in line 66:

curve-pool-registry/contracts/CurveCalc.vy

Line 66 in d6d346e

Ann: uint256 = amp * n_coins_256

Shouldn't it be: Ann = amp * (n_coins_256 ^ n_coins_256) ?

I was also wondering if there is any particular reason for not implementing a more sophisticated numerical method? Also, on the tolerance for D, wouldn't it be better if we got a more precise D?

Thanks,
Thoma