p4raw-id: //depot/perl@20088
Note that using the v-strings for IPv4 addresses is not portable unless
you also use the inet_aton()/inet_ntoa() routines of the Socket package.
+Note that since Perl 5.8.1 the single-number v-strings (like C<v65>)
+are not v-strings before the C<< => >> operator. (They were v-strings
+from Perl 5.6.0 to Perl 5.8.0, but that caused more confusion and
+breakage than good.)
+
=head3 Special Literals
The special literals __FILE__, __LINE__, and __PACKAGE__