src/it/unimi/dsi/fastutil/io/InspectableFileCachedInputStream.java
public void clear() throws IOException {
		if (! fileChannel.isOpen()) throw new IOException("This " + getClass().getSimpleName() + " is closed");
		writePosition = position = inspectable = 0;
		mark = -1;
	}
public void clear() throws IOException {
		if (! fileChannel.isOpen()) throw new IOException("This " + getClass().getSimpleName() + " is closed");
		writePosition = position = inspectable = 0;
		mark = -1;
	}
Clears the content of this {@link InspectableFileCachedInputStream}, zeroing the length of the represented
stream.