// ets_tracing: off
import * as Tp from "../Collections/Immutable/Tuple";
import * as O from "../Option";
import { modify } from "./modify";
/**
 * Atomically modifies the `FiberRef` with the specified partial function and
 * returns the old value.
 * If the function is undefined on the current value it doesn't change it.
 */

export const getAndUpdateSome = f => modify(v => Tp.tuple(v, O.getOrElse_(f(v), () => v)));
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