Replacing StorageImpl with itself?

hello - 

I am looking for some insight into what might be going on with the workaround to Wrong LocalStorage event fire #9205, an issue raised about a year and a half ago.

I have observed the behavior described in the issue. I have also followed the workaround described in the comments and found that it does work around the issue.

The workaround is to add the following configuration, which appears to replace StorageImpl with itself:

  <replace-with class="com.google.gwt.storage.client.StorageImpl">
    <when-type-is class="com.google.gwt.storage.client.StorageImpl" />
    <any>
      <when-property-is name="user.agent" value="safari" />
      <when-property-is name="user.agent" value="ie9" />
      <when-property-is name="user.agent" value="ie10" />
      <when-property-is name="user.agent" value="gecko1_8" />
    </any>
  </replace-with>

I am trying to understand - why does this change anything?

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