RxSwiftでdelegate入れ直してるのは https://github.com/ReactiveX/RxSwift/blob/21e0fb8a1e071b02b04a4acc6f0125e5ae64511d/RxCocoa/Common/DelegateProxyType.swift#L203 からの https://github.com/ReactiveX/RxSwift/blob/e479d0029db0575e03e3c092e1c9724b9410eab7/RxCocoa/Common/DelegateProxy.swift#L240 かな

ReactiveX/RxSwift

RxSwift - Reactive Programming in Swift

ReactiveX/RxSwift

RxSwift - Reactive Programming in Swift

1