Very small perf tweak to help box2 (#17138)
Very small perf tweak to help box2 (#17138)

* Very small perf tweak to help box2

* Pre-size the output array

* Not sure why there is letter spacing in snapshot now

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client