IPv4 loopback overridden

[TownCube]

Commit 9fd7397 states

prefer IPv6 loopback when available (::) instead of IPv4 loopback (0.0.0.0), unless 0.0.0.0 is explicitly passed.

However this commit now always uses the IPv6 loopback even when the IPv4 loopback (0.0.0.0) is explicitly passed.

    if (!options.hostname || options.hostname === '*' || options.hostname === '0.0.0.0') {
      options.hostname = '::';
    }

This breaks IPv4 only environments with error:

Fatal error: listen EAFNOSUPPORT: address family not supported :::8081