fixup! fixup! net: make server.address() return a string for family

doc/api/dns.md

@@ -183,7 +183,7 @@ changes:
     pr-url: https://github.com/nodejs/node/pull/43054
     description: For compatibility with `node:net`, when passing an option
                  object the `family` option can be the string `'IPv4'` or the
-                 string `'IPv6'`, in which case its value will be ignored.
+                 string `'IPv6'`.
   - version: v18.0.0
     pr-url: https://github.com/nodejs/node/pull/41678
     description: Passing an invalid callback to the `callback` argument
@@ -202,10 +202,10 @@ changes:
 
 * `hostname` {string}
 * `options` {integer | Object}
-  * `family` {integer} The record family. Must be `4`, `6`, or `0`. For backward
-    compatibility reasons,`'IPv4'` and `'IPv6'` are interpreted as `0`. The
-    value `0` indicates that IPv4 and IPv6 addresses are both returned.
-    **Default:** `0`.
+  * `family` {integer|string} The record family. Must be `4`, `6`, or `0`. For
+    backward compatibility reasons,`'IPv4'` and `'IPv6'` are interpreted as `4`
+    and `6` respectively. The value `0` indicates that IPv4 and IPv6 addresses
+    are both returned. **Default:** `0`.
   * `hints` {number} One or more [supported `getaddrinfo` flags][]. Multiple
     flags may be passed by bitwise `OR`ing their values.
   * `all` {boolean} When `true`, the callback returns all resolved addresses in

lib/dns.js

@@ -142,8 +142,10 @@ function lookup(hostname, options, callback) {
     if (options?.family != null) {
       switch (options.family) {
         case 'IPv4':
+          family = 4;
+          break;
         case 'IPv6':
-          family = 0;
+          family = 6;
           break;
         default:
           validateOneOf(options.family, 'options.family', validFamilies, true);