@mdboom - I'm not sure there really are rounding issues, since the conversion will likely get done anyway when it is used -- just above, there is `np.mod(self - self.wrap_angle, d360)`, which will effectively to 
`np.mod((self-self.wrap_angle.to(self.unit)).value, d360.to(self.unit).value) * self.unit`

@taldcroft - I thought it made more sense to have it show the same unit by default, and then figured it was easier just to set it with the same unit in the first place. In principle, this could also be in the `wrap_angle` propery (`return self._wrap_angle.to(self.unit)`), though I'm happy to just revert it as well.