[w3c/ServiceWorker] Why is the scope to registration map and ordered map? (#1225)

Why is the scope to registration map and ordered map?

See https://w3c.github.io/ServiceWorker/#dfn-scope-to-registration-map.

This ordered is exposed via getRegistrations() but I do not know that the insertion order is useful. Keeping such order has a cost so I'd like to understand why it is mandated by the specification.

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