/**
 * @template {Float64Array | number[]} T
 * @category Optimization
 * @param {(d: T) => number} f
 * @param {T} x0
 * @param {number} [max_iter=300] Default is `300`
 * @returns {T}
 * @see http://optimization-js.github.io/optimization-js/optimization.js.html#line438
 */
export function powell<T extends Float64Array | number[]>(
  f: (d: T) => number,
  x0: T,
  max_iter?: number,
): T;
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