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A more complicated case is related to ordering, which is how to deal with bundles that were installed before the manager was present and/or activated). In this case, a normal update is not completely sufficient since the manager really wants to update the bundle to a virtual bundle, but keep its existing content. Technically, this is possible with the current API by using the entry-related Bundle methods to reconstructor the installed bundle, then performing an update on it to convert it to a virtual bundle.
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