Re: [w3c/ServiceWorker] Remove incumbent/fetching record from Cache behavior (#1190)

jakearchibald commented on this pull request.



>              1. If |cacheExists| is true, then:
-                1. Delete a <a>Record</a> {\[[key]], \[[value]]} <var ignore>entry</var> from its <a>name to cache map</a> where |cacheName| matches entry.\[[key]].
+                1. [=map/Remove=] the [=name to cache map=][|cacheName|].
                 1. Return true.

Although it's on the microtask queue, it's still blocking the event loop. I think we need to create a promise and return it.

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