Add check is object for each item in data

[mephistorine]

Now if some item of data not object, something went wrong.

Below code of function checks object or not item:

/**
 * Checks some is object
 *
 * @param some Something to check
 * @returns TRUE if it object, FALSE otherwise
 */
export function isObject<T>(some: T): some is T {
  return Object.prototype.toString.call(some) === '[object Object]'
}