title: Maximum serialized Protobuf message size
body: <p>Is there a way to get the maximal size of a certain protobuf message after it will be serialized?</p>
  
  <p>I'm referring to messages that don't contain "repeated" elements.</p>
  
  <p>Note that I'm <em>not</em> referring to the size of a protobuf message with a specific content, but to the <em>maximum possible</em> size that it can get to (in the worst case).</p>