Advanced Flutter architectures often use ________ to handle side effects and asynchronous operations.

Advanced Flutter architectures often use RxDart to handle side effects and asynchronous operations. RxDart is an extension of Dart's Stream API that provides powerful tools for reactive programming. It leverages observables, streams, and operators to simplify the handling of asynchronous events and state changes. RxDart is commonly used in conjunction with other state management solutions to achieve a reactive and scalable architecture in Flutter applications.