I read like half of the novel a couple of years ago. The movie is loosely based on it so things of this sort are open to interpretation (not to mentioned the different versions)... but as far as I know R Scott said that Deckard is indeed a Replicant.
Some suggest that he may be next-generation replicant (Nexus-7)...
But also due to the film ambigous attitude some people said R Scott leave the question unanswered to retain one of the core subjects/topics... what is to be human.
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