Re: [ServiceWorker] Race when registering multiple service workers for the same scope (#783)

That option was considered but not proper to synchronize the Unregister with Register/Update where Unregister is effective only when all the clients are unloaded. That is, it's not practical for all the Register/Update requests coming from different tabs and Soft Updates in parallel to hold until the condition for Unregister is met.

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https://github.com/slightlyoff/ServiceWorker/issues/783#issuecomment-160836018