Correct difference between rule set and object in docs
Correct difference between rule set and object in docs

Sets only define a key in the head, not a value. The docs implied
the opposite.

open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa,Eva-xiaohui-luo/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa,Eva-xiaohui-luo/opa,tsandall/opa,Eva-xiaohui-luo/opa