We generalize fetch to operate as a federation citizen where *the History of one page* (⇒ Memory, Journal) offers good advice as to where to find another. We call this searching "Polymorphism" because of the similarity to object-oriented polymorphic message dispatch.
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In any case, it is always possible to change the data Structure, as long as it is polymorphic. –– Juan Vuletich via Cuis-dev mailing list. post 
Modern client-side javascript offers a function, fetch, which returns a Promise to the response of an http request. I've launched as many as 450 simultaneous fetches and gotten good results. Amazing. Now we generalize fetch to operate as a federation citizen where the history of one page offers good advice as to where to find another. We call this searching "polymorphism" because of the similarity to object-oriented polymorphic message dispatch.