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If a peer is connected to multiple nodes in a region (so multiForwarder is in use) and then a node restarts and re-sends all its additions, this bug about whether an element is in the multiForwarder could cause a one-time flip in the which peer node we forward to. Note a huge deal, but not written as intended. Thanks to @lewgun for the bug report in #2141. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>