When linking a rotation property to a non-rotation property (going in either
direction - i.e. rot -> normal, normal -> rot), the driver expression will
now be set so that the new drivers behave as expected (i.e. you get the values
you see, instead of "weird" values that seem several orders of magnitude off).
This may not be that great for everyone (i.e. the rare users out there who
actually like to look at their rotations in radians), but they usually know
what they're doing anyway, so this will be easy to correct.
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