Fix the PartialEq impl for quaternions. #814
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The double-covering property should only be taken into account for `UnitQuaternion` instead of `Quaternion` itself.
sebcrozet
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The double-covering property should only be taken into account for
UnitQuaternioninstead ofQuaternionitself.As a result we no longer have the blancket impl of
PartialEqforUnit<T>. Instead, it is implemented for each specialization ofUnit. So this is a breaking change.This also simplifies some of the trait bounds required by
Quaternionfor basic implementations likeHash,PartialEq,Eq,CopyandClone. That way, we can auto-derive them.