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Persistently cached objects for PB.
Maintainer: Glyph Lefkowitz
Future Plans: None known.
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Wrap a deferred returned from a pb method in another deferred that
expects a RemotePublished as a result. This will allow you to wait until
the result is really available.
Idiomatic usage would look like::
publish.whenReady(serverObject.getMeAPublishable()).addCallback(lookAtThePublishable)
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