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Computing the shape of a B-Bone is a quite expensive operation, and there are multiple constraints that can access this information in a variety of useful ways. This means computing the shape once per bone and saving it is good for performance. Since the shape may depend on the position of up to two other bones, often in a "cyclic" manner, this computation has to be a separate node with its own dependencies. Reviewers: sergey Differential Revision: https://developer.blender.org/D3975