javascript engine: Proxy handler.get() doesn't work on field 'name'

function test_proxy() {

        let base =

{             id: 'baseid',             name: 'basename',             type: 'basetype'         }

        let handler = {
            get: function(ao, prop)

{                 return Reflect.get(ao, prop);             }

        }

        let r = new Proxy(base, handler);

        // these fields work fine except 'name' shown later...
        console.info("xx", r.id);
        console.info("xx", r.type);

        // r.name is supposed to be 'basename', but got empty string always.
        console.info("xx", r.name);
}

 

===== output =====

qml: xx baseid
qml: xx basetype
qml: xx