message: Use a private member for stateProxy
diff: @@ -77,10 +77,10 @@ function stateProxyHandler(workflowSession: WorkflowSession) {
  export default class WorkflowSession {
  workflow: any;
  - _stateProxy: any;
  + #stateProxy: any;
  constructor(workflow?: any) {
  this.workflow = workflow;
  - this._stateProxy = new Proxy({}, stateProxyHandler(this));
  + this.#stateProxy = new Proxy({}, stateProxyHandler(this));
  }
  @tracked _state: Record<string, string> = {};
  @@ -94,7 +94,7 @@ export default class WorkflowSession {
  }
  get state(): Record<string, SupportedType> {
  - return this._stateProxy;
  + return this.#stateProxy;
  }
  get hasPersistence() {
  