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This changes a number of loops currently using `Dict.prototype.{getKeys, getRaw}`, since it should be a tiny bit more efficient to use an iterator directly rather than first iterating through `Map`-keys to create a temporary `Array` that we finally iterate through at the call-site.
Note that the `getKeys` method is much older than `getRawEntries`, and originally the `Dict` class stored its data in a regular `Object`, hence why the old code was written that way.