Why Option<_> (#746)
Add a comment about why `UnitQuaternion::rotation_between` returns an Option.
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@ -374,7 +374,8 @@ where
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/// The unit quaternion needed to make `a` and `b` be collinear and point toward the same
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/// The unit quaternion needed to make `a` and `b` be collinear and point toward the same
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/// direction.
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/// direction. Returns `None` if both `a` and `b` are collinear and point to opposite directions, as then the
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/// rotation desired is not unique.
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///
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///
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/// # Example
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/// # Example
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/// ```
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/// ```
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