[squid-users] acl dst 255.255.255.255 means "no such hostname"?

Hello,

I found out that if I deny users going to 255.255.255.255, it is the same as
if I denied going to unknown hostnames:

acl bogus dst 255.255.255.255
http_access deny bogus

Originally I wanted to deny customers goind to reserved IP spaces defined by
RFC1918 and RFC3330:

acl bogus dst 0.0.0.0/8 10.0.0.0/8 127.0.0.0/8 169.254.0.0/16 172.16.0.0/12 192.0.2.0/24 192.168.0.0/16 198.18.0.0/15 224.0.0.0/4 240.0.0.0/4
 
and I was very surprised that now I get "access denied" instead of "Unable
to determine IP address" (aka "The domain name does not exist.").

Is this wanted behaviour, a side effect of something (probably when
getnostname() returns -1) or a bug? Should I fill a bugreport?

(squid 2.5.STABLE10 on gentoo linux)

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