code: @Contract(pure = true)
  	public byte peek(int offset) {
  		assert !isRecycled() : "Attempt to use recycled bytebuf";
  		assert (head + offset) < tail;
  		return array[head + offset];
  	}
docs: Returns a {@code byte} from this {@link #array} which is
  located at {@link #head} position increased by the offset
  if this {@code ByteBuf} is not recycled. {@link #head} doesn't
  change.
  
  @param offset added to the {@link #head} value. Received value
  must be smaller than current {@link #tail}.
  @return a {@code byte} from this {@link #array} which is
  located at {@link #head} with provided offset