cue: make use of Go 1.20+ APIs
Now that we require Go 1.20 or later, we can use reflect.Value.SetZero
and bytes.Clone, which are clearer and faster.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I6bee04ec9e42aaaa4d15e1bc8e1aa90d64b4134b
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1167629
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>