Method replaceTop

src/main/java/com/google/gson/stream/JsonReader.java:664–666

Replace the value on the top of the stack with the given value.

(JsonScope newTop)

   * Replace the value on the top of the stack with the given value.
   */
  private void replaceTop(JsonScope newTop) {
    stack.set(stack.size() - 1, newTop);
  }

  @SuppressWarnings("fallthrough")
  private JsonToken nextInArray(boolean firstElement) throws IOException {