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Thanks to the observation (supported by counting) that the vast majority paths have neither generics no type anchors, and thanks to a new datastructure `ThinVecWithHeader` that is essentially `(T, Box<[U]>)` but with the size of a single pointer, we are able to reach this feat. This (together with `ThinVecWithHeader`) makes the possibility to shrink `TypeRef`, because most types are paths.