I'm not because I don't use the feature. but if you're going to ask for everything just for a count, might as well trust the relay for that, because it's meaningless anyway and the relay doesn't have to send everything and you don't have to download everything just to discard it afterwards. but just because I don't use it doesn't mean that other don't as well, so if clients will do it because they can, they will, and in that scenario, it is best to have a better solution with tradeoffs both agree. 

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