gremlin-tools/gremlin-io-test/src/test/resources/org/apache/tinkerpop/gremlin/structure/io/graphson/_3_3_9/set-v3d0.json

{
  "@type" : "g:Set",
  "@value" : [ {
    "@type" : "g:Int32",
    "@value" : 1
  }, "person", true ]
}