/**
 * Copy data from one array to another if they are not present in the destination array
 * @template T
 * @param {T[]} source The source array
 * @param {number} source_position Starting position where to copy from inside the source array
 * @param {T[]} destination The destination array
 * @param {number} destination_position Starting position where to copy to inside the destination array
 * @param {number} length How many elements should be copied
 * @returns {number} unique addition count
 */
export function array_copy_unique<T>(source: T[], source_position: number, destination: T[], destination_position: number, length: number): number;
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