docs: function isPlainObject(value) {
  	if (!isObjectLike(value) || getTag(value) != '[object Object]') {
  		return false
  	}
  	if (Object.getPrototypeOf(value) === null) {
  		return true
  	}
  	let proto = value;
  	while (Object.getPrototypeOf(proto) !== null) {
  		proto = Object.getPrototypeOf(proto);
  	}
  	return Object.getPrototypeOf(value) === proto
  }