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"I, Tonya" announces up front that it's based on "irony free, wildly contradictory" interviews with the participants, yielding a darkly satiric comedy with the tenor of a Coen brothers movie. Elevated by Margot Robbie and Allison Janney's shimmering performances, this entertaining account of those strange events earns the sort of high marks for creative interpretation that its protagonist complained eluded her.