shadows/framework/src/main/java/org/robolectric/shadows/ShadowParcel.java
private Object peek() {
      return dataPosition < dataSize && data[dataPosition] != null
          ? data[dataPosition].value
          : null;
    }
private Object peek() {
      return dataPosition < dataSize && data[dataPosition] != null
          ? data[dataPosition].value
          : null;
    }
Returns the item at the current position, or null if uninitialized or null.