Entity unload resource leaks

testEntityResourceLeaks-entity.js

(function() {
    var TROMBONE_URL = "https://s3.amazonaws.com/hifi-public/tony/audio/sad-trombone.wav";
    return {
        _resource: SoundCache.prefetch(TROMBONE_URL),
        _sound: undefined,
        _onStateChanged: function() {
            var resource = this._resource;
            if (resource.state === Resource.State.FINISHED) {
                resource.stateChanged.disconnect(this, '_onStateChanged');
                this._sound = SoundCache.getSound(TROMBONE_URL);
                this.play();
            } else if (resource.state === Resource.State.FAILED) {
                resource.stateChanged.disconnect(this, '_onStateChanged');
                this._sound = null;
                print("Failed to download sound: " + TROMBONE_URL);
            }
        },
        preload: function(uuid) {
            print("++ resource check preload", uuid);
            this._resource.stateChanged.connect(this, '_onStateChanged');
            this._onStateChanged();
        },
        play: function(uuid, args) {
            if (this.tromboneInjector) {
                this.tromboneInjector.restart();
            } else {
                this.tromboneInjector = Audio.playSound(this._sound, {
                    position: MyAvatar.position,
                    volume: .01,
                    loop: true,
                    localOnly: true,
                });
            }
        },
        stop: function(uuid, args) {
            if (this.tromboneInjector) {
                this.tromboneInjector.stop();
            }
        },
        unload: function(uuid) {
            print("-- resource check unload", uuid);
            this.stop();
            if (this._sound === undefined) {
                this._resource.stateChanged.disconnect(this, '_onStateChanged');
            }
        },
    };
})

testEntityResourceLeaks.js

var uuid = Entities.addEntity({
    type: 'Sphere',
    position: MyAvatar.position,
    collisionless: true,
    script: Script.resolvePath('').replace('.js','-entity.js'),
    lifetime: 60
});
print('== created entity', uuid);
Script.scriptEnding.connect(function() { Entities.deleteEntity(uuid); });