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/** * Copies the values of `source` to `array`. * * @private * @param {Array} source The array to copy values from. * @param {Array} [array=[]] The array to copy values to. * @returns {Array} Returns `array`. */function copyArray(source, array) {  var index = -1,      length = source.length;
  array || (array = Array(length));  while (++index < length) {    array[index] = source[index];  }  return array;}
module.exports = copyArray;