Example opa bench command

opa bench 'data.hooks.target.violation' -i input.json -d constraints.rego -d gatekeeper.rego -d template.rego -d data_1x.json

Results

Baseline

# of constraints	Latency (ns)
1	956,088
10	9,189,042
100	100,137,817

Use object.get instead of get_default Rego function

# of constraints	Latency (ns)
1	341,791
10	2,886,927
100	30,387,561

Use . and not instead of has_field Rego function

# of constraints	Latency (ns)
1	279,363
10	2,228,619
100	23,188,588

The semantics aren't quite the same however none of has_field cases should be affected (since the fields being checked are never boolean valued.)