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Most of the time Stretch To is used in actual rigs, like BlenRig or Rigify, in combination with Damped Track to handle rotation before the stretch, because it produces rotations more appropriate for organic deformation, and doesn't flip because of internal gimbal lock. The prevalence of this pattern suggests that Stretch To should support that kind of rotation directly as an option. Differential Revision: https://developer.blender.org/D6134