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define(['./_copyObject', './keysIn'], function(copyObject, keysIn) {
  /**   * The base implementation of `_.assignIn` without support for multiple sources   * or `customizer` functions.   *   * @private   * @param {Object} object The destination object.   * @param {Object} source The source object.   * @returns {Object} Returns `object`.   */  function baseAssignIn(object, source) {    return object && copyObject(source, keysIn(source), object);  }
  return baseAssignIn;});