Any advice for vending a signal as a property which merges signals which can't be initialized 'till "later"?
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Vend a RACSubject and subscribe: it to the merged signal when I can make it?
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Are the mergees coming from within the same module, or a consumer?
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Same module. Say a view controller; can't make the mergees until DidAppear.
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Expose a readonly RACSignal, backed by a RACSubject ivar (perhaps with -flatten or something applied to it).
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We 100% avoid readwrite signal properties, and try really hard to avoid subjects except as an implementation detail.
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