redSqrt function seems error

[wz003]

a Red { m: <BN: b>, prime: null } tmp = new BN(2).toRed(a) <BN-R: 2> tmp.redSqrt() <BN-R: 8>

2 doesn't have quadratic residue in (mod 11), but it return 8

is there a bug or am I misunderstanding this function?

[dcousens]

@indutny any insight here?

[indutny]

I think it works only with prime modulo.