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portlist: update some internals to use append-style APIs
In prep for reducing garbage, being able to reuse memory. So far this doesn't actually reuse much. This is just changing signatures around. But some improvement in any case: bradfitz@tsdev:~/src/tailscale.com$ ~/go/bin/benchstat before after name old time/op new time/op delta GetList-8 11.8ms ± 9% 9.9ms ± 3% -15.98% (p=0.000 n=10+10) name old alloc/op new alloc/op delta GetList-8 99.5kB ± 2% 91.9kB ± 0% -7.62% (p=0.000 n=9+9) name old allocs/op new allocs/op delta GetList-8 3.05k ± 1% 2.93k ± 0% -3.83% (p=0.000 n=8+9) More later, once parsers can reuse strings from previous parses. Updates #5958 Change-Id: I76cd5048246dd24d11c4e263d8bb8041747fb2b0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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