// Examples:
  //   - Expression accessing a property named "namespace": {"Expression": "object.__namespace__ > 0"}
  //   - Expression accessing a property named "x-prop": {"Expression": "object.x__dash__prop > 0"}
  //   - Expression accessing a property named "redact__d": {"Expression": "object.redact__underscores__d > 0"}
  //
  // Equality on arrays with list type of 'set' or 'map' ignores element order, i.e. [1, 2] == [2, 1].