$OLD_PERL_VERSION was never exported (it was added commented-out in Perl
5.6.0, when $PERL_VERSION became $^V). $OFMT and $ARRAY_BASE were
commented out in Perl 5.000.
=over 8
-=item $OFMT
-
=item $#
-X<$#> X<$OFMT>
+X<$#>
C<$#> was a variable that could be used to format printed numbers.
After a deprecation cycle, its magic was removed in Perl v5.10.0 and
Removed in Perl v5.10.0.
-=item $ARRAY_BASE
-
=item $[
-X<$[> X<$ARRAY_BASE>
+X<$[>
This variable stores the index of the first element in an array, and
of the first character in a substring. The default is 0, but you could
Deprecated in Perl v5.12.0.
-=item $OLD_PERL_VERSION
-
=item $]
-X<$]> X<$OLD_PERL_VERSION>
+X<$]>
See L</$^V> for a more modern representation of the Perl version that allows
accurate string comparisons.