+ we don't need an exactly accurate count of the number of times each
time ran. Remove -covermode, the default "set" will be fine to just
track whether a given line ran at all.
+ add -benchtime=1x. We only need to run the benchmarks once.
+ -bench=. to match any character.
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
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