/**
 * Transposes a 2x2 matrix, stored in a flattened array.
 *
 * @param {number[]} out Output: The transposed matrix. Can be the same array as `m`.
 * @param {number[]} m Input: The 2x2 matrix to transpose, stored as a flattened array [a, b, c, d], representing [[a, c], [b, d]].
 * @returns {number[]} The `out` parameter.
 */
export function m2_transpose(out: number[], m: number[]): number[];
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