/**
 * Split an array into chunks of specified size.
 *
 * @param arr - Input array
 * @param size - Size of each chunk (must be >= 1)
 * @returns Array of chunks
 *
 * @example
 * chunkFast([1, 2, 3, 4, 5], 2) // [[1, 2], [3, 4], [5]]
 */
export declare function chunkFast<T>(arr: readonly T[], size: number): T[][];
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