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Java Util api extends by Ultreia.io (not guava, nor commons)

There is a newer version: 1.2.1

package io.ultreia.java4all.util;

/*-
 * #%L
 * Java Util extends by Ultreia.io
 * %%
 * Copyright (C) 2018 Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Properties;
import java.util.Set;
import java.util.function.Function;

/**
 * Extends {@link Properties} and ensure order on keys (using natural order on {@link #function} method).
 * 
 * This means that when you will {@code load} or {@code store} , this order will be used.
 * Created by tchemit on 29/12/2017.
 *
 * @author Tony Chemit - [email protected]
 */
public class SortedProperties extends Properties {

    private static final long serialVersionUID = -1L;

    private Function function = Object::toString;

    public SortedProperties() {
    }

    public SortedProperties(Properties defaults) {
        super(defaults);
    }

    @Override
    public synchronized Enumeration