Quaternion of unit matrix gives wrong result

[Tobimaru]

The opengv::math::rot2quaternion function returns a quaternion with NaN values for an identity matrix, while this should be (1, 0, 0, 0). The function opengv::math::quaternion2rot returns an identity matrix for the quaternion (1, 0, 0, 0). Is this intended behavior or can this be considered as a bug?