`GProxyAddressEnumerator` is a wrapper around [class@Gio.
SocketAddressEnumerator] which takes the [class@Gio.SocketAddress] instances returned by the [class@Gio.SocketAddressEnumerator] and
wraps them in [class@Gio.ProxyAddress] instances, using the given [property@Gio.ProxyAddressEnumerator:proxy-resolver].
This enumerator will be returned (for example, by [method@Gio.SocketConnectable.enumerate]) as appropriate when a proxy is configured;
there should be no need to manually wrap a [class@Gio.SocketAddressEnumerator] instance with one.