Tinyproxy won't listen to IPv6 and IPv4 at the same time

[dnmvisser]

I'm trying to set up Tinyproxy on a 64-bit Ubuntu 12.04 server system, and I'm using the packaged version 1.8.3.
The system has fully working dual stack network connectivity.
According to the inline docs in the configuration file /etc/tinyproxy.conf:

# Listen: If you have multiple interfaces this allows you to bind to
# only one. If this is commented out, tinyproxy will bind to all
# interfaces present.

However, without configuration Tinyproxy only listens on IPv4.
Explicit configuration per protocol seems to work:

"Listen 0.0.0.0" makes it listens on IPv4 only.
"Listen ::" makes it listen on IPv6 only.

But no way to have it listen to both IPv4 and IPv6...

[dnmvisser (dnmvisser)]

It seems tinyproxy does listen to both protocols, I didn't test properly.
I assumed that this result:

netstat -tlnpvw | grep tinyproxy
tcp6 0 0 :::8888 :::* LISTEN 3946/tinyproxy

meant that it didn't listen on v4... but I was wrong.

Listen ::
#This will accept connections on IPv6, but also on IPv4: IPv4-mapped IPv6 addresses are used:
#CONNECT Jan 04 15:29:13 [23566]: Connect (file descriptor 6): host.terena.org [::ffff:192.87.30.2]

Listen 0.0.0.0
# This will listen on IPv4 only

Listen 2001:610:148:dead::666
# This will listen only on the specified IPv6 address. Not nice, but workable.