title: Size of string variable
body: <p>I've got 2 questions:</p>
  <ol>
  <li>How much RAM does string variable use? Is it 28 bytes and no matter how many chars it consists of?</li>
  <li>What if length of such string is more than 28 chars? Does it take 2x more (56 bytes) or not?</li>
  </ol>