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https://dvcs.w3.org/hg/quota/raw-file/tip/Overview.html#storagequota-interface Calling requestPersistentQuota(-1) could result in requesting an unexpectedly huge quota value. We should add [Clamp] so that out-of-range value is always clamped in the same way across implementation.
Updated the draft: Promise requestPersistentQuota ([Clamp] unsigned long long newQuota);