sub chop { CORE::chop $_[0] }
sub reverse { CORE::reverse $_[0] }
sub length { CORE::length $_[0] }
-sub index { CORE::index $_[0], $_[1], (defined $_[2] ? $_[2] : ()) }
+sub index {
+ return CORE::index($_[0], $_[1]) if scalar @_ == 2;
+ return CORE::index($_[0], $_[1], $_[2]);
+}
# FIXME: this is not working
#sub rindex { CORE::rindex $_[0], $_[1], (defined $_[2] ? $_[2] : ()) }