我正在尝试设置基数。例如，它可以与addV一起使用

await g.V(id1).property(single, 'timestamp', 10).next();

但是，当我尝试使用mergeV时，它不起作用

const properties = new Map([
            ['prop1', CardinalityValue.single('prop1value3')],
            ['prop2', CardinalityValue.single('prop2value3')]
        ]);
        const propertiesNoCard = new Map([
            ['prop1', 'prop1value3'],
            ['prop2', 'prop2value']
        ]);

        await g
            .mergeV(
                new Map([
                    [t.label, 'test'],
                    [t.id, 'testid']
                ])
            )
            .option(onCreate, propertiesNoCard)
            .option(onMatch, properties)
            .iterate();

ResponseError: Server error: {"code":"UnsupportedOperationException","requestId":"408e6686-68dc-4700-b2c5-9d816d2a7bdb","detailedMessage":"Unsupported property value type: org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.DefaultGraphTraversal","message":"Unsupported property value type: org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.DefaultGraphTraversal"} (499)

我之所以这样做是因为在gremlin源代码的gremlin-javascript/test/cucumber/gremlin.js中，有一些例子他们调用CardinalityValue.xxx，https://github.com/apache/tinkerpop/blob/master/gremlin-javascript/src/main/javascript/gremlin-javascript/test/cucumber/gremlin.js

function({g}) { return g.mergeV(new Map([["name","marko"]])).option(Merge.onMatch,new Map([["age",CardinalityValue.single(33)]])) }

如果我这样声明它，从Gremlin MergeV To Update an Existing Element's property and Single Cardinality得到，它就可以工作。

const properties = new Map([
            ['prop1', CardinalityValue.single('prop1value3')],
            ['prop2', CardinalityValue.single('prop2value3')]
        ]);
        const propertiesNoCard = new Map([
            ['prop1', 'prop1value3'],
            ['prop2', 'prop2value']
        ]);

        await g
            .mergeV(
                new Map([
                    [t.label, 'test'],
                    [t.id, 'testid']
                ])
            )
            .option(onCreate, propertiesNoCard)
            .option(
                onMatch,
                __.sideEffect(__.property(single, 'prop1', 'prop1val23').property(single, 'prop2', 'prop2val23')).constant(
                    new Map()
                )
            )
            .iterate();