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Renée Zellweger’s new Netflix series, “What/If,” is being called a gender-swapping spin on “Indecent Proposal” — but the author of the book that spawned the Robert Redford-Demi Moore movie sensation says he was left in the dark.

Jack Engelhard says the Netflix series came as “news to me.”

When reviews of the show posted, Engelhard received “at least 20 phone calls saying, ‘Congratulations, Jack, you did it again!’ I said, ‘What did I do?’”

“What/If” even pays homage to “Indecent Proposal” in its pilot episode, when one character exclaims, “This whole idea was ripped out of a bad ’90s movie.”

Engelhard told us, “Some credit to the novelist might be fair, for producing a moral dilemma that captivated the world.” (He called his attorney on Tuesday — but the legal eagle quickly informed him he had no claim and to “be happy.”)

The 1993 film cut out the best seller’s political themes, but Engelhard said of the Paramount production: “I got paid. No complaints.”

Paramount is developing an “Indecent Proposal” remake by “The Girl on the Train” screenwriter Erin Cressida Wilson, and a musical version is being developed for the West End.