On Darwin, asynchronous usage of Operation is supported via KVO notifications.
Because KVO is only available on Darwin platforms, swift-corelibs-foundation currently does not support asychronous Operations, and there is a comment to that effect: https://github.com/apple/swift-corelibs-foundation/blob/6c2afef20330681ec1f8e4e4e3e2664bfd758888/Foundation/NSOperation.swift#L50 My understanding is that it's unlikely KVO will arrive on Linux any time soon, so this leaves us with a problem in Operation. Asynchronous usage of Operation is an important feature. Is there any way that we could support asynchronous operations in swift-corelibs-foundation, in the absence of KVO? Might it be acceptable to add extra temporary public API to enable this? Many thanks, -- Ian Partridge
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