Re: [whatwg/storage] "syncable" storage? (#1)

The concerns about syncing everything are performance and reconciliation. On the performance front we probably don't want to sync storage which is effectively "cache". On the reconciliation front, if we sync everything then either we block access to storage while sync is happening or we define it for all storage types. We'd need to do that for cross-device sync anyway (even if it's just "most recent wins").

But we haven't thought deeply about this yet. Most of the developers we've talked with here want to be in control, and manage deciding what to sync / who the back end is / how reconcile changes themselves, and there's an ecosystem of providers like Firebase that give you an API for that. The scenario of "just make it work transparently" may turn out to be something we can handle entirely in the UA for sites that don't have a lot of data, using various signals. 

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