</description>
          <type>String</type>
        </field>
        <field>
          <name>post</name>
          <version>3.0.0+</version>
          <description>
            The email address or link that can be used to post to
            the mailing list.  If this is an email address, a
            {@code mailto:} link will automatically be created

          K extends @Nullable Object, V extends @Nullable Object>
      extends AbstractMap<K, V> {
    /**
     * Creates the entry set to be returned by {@link #entrySet()}. This method is invoked at most
     * once on a given map, at the time when {@code entrySet} is first called.
     */
    abstract Set<Entry<K, V>> createEntrySet();

    @LazyInit @CheckForNull private transient Set<Entry<K, V>> entrySet;