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Otherwise on OS retransmits, we'd make redundant timers in Go's timer heap that upon firing just do nothing (well, grab a mutex and check a map and see that there's nothing to do). Updates #cleanup Change-Id: Id30b8b2d629cf9c7f8133a3f7eca5dc79e81facb Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>