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However, mattress firmness is ultimately subjective. What’s best for you will also vary depending on your body weight (heavyweight sleepers generally need a firmer mattress for adequate support compared to lightweight sleepers), sleeping position, and overall personal preference.
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As for specs, Mark Gurman has suggested that it'll be getting an upgrade to the A19 chip, which is nice. Also, it could be getting MagSafe support. That sounds like an iterative upgrade, but the price is expected to remain steady at $599.
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