Is it really zero cost?

<img width="1181" height="282" alt="Image" src="https://github.com/user-attachments/assets/362d7a49-ed8c-4fb2-a1cd-56d40585f3b6" />

I thought (based on crate's description) it is zero-cost, but the size of the graph reference is 168 which is obviously not equal to the size of the pointer to graph.
If it is not zero-cost, maybe you can clarify this in the crate please 🙏 