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define(['./_baseAssignValue', './eq'], function(baseAssignValue, eq) {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /**   * This function is like `assignValue` except that it doesn't assign   * `undefined` values.   *   * @private   * @param {Object} object The object to modify.   * @param {string} key The key of the property to assign.   * @param {*} value The value to assign.   */  function assignMergeValue(object, key, value) {    if ((value !== undefined && !eq(object[key], value)) ||        (value === undefined && !(key in object))) {      baseAssignValue(object, key, value);    }  }
  return assignMergeValue;});