Really interesting! I wonder what would happen if you combine these two properties. Suppose some length of the middle is all walls, and the hooks are infill, or vice versa. Is there an optimal mix that maximizes the weight it can support in your testing, or have you found the optimal configuration (with infill along the entire length) already?
Its use looks contrived to me on the linked GitHub page. The comparison with @ and # is flawed because those symbols are part of the resource name, whereas here the symbol is superfluous. It’s like adding a 🌐 in front of every web URL.