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Consistently interning the NodePublic's throughout DERP, particularly inside the maps reduces memory usage and reduces lookup costs in the associated data structures. It is not clear exactly how efficient the weak pointers will be in practice, but estimating this using derpstress with 10k conns pushing 40kpps in each direction, this is patch grows heap at approximately half the rate vs. the old code and has fewer instances of long stalls that trigger i/o timeouts for the clients. Updates tailscale/corp#24485 Signed-off-by: James Tucker <james@tailscale.com>