add override_stringify config option

lib/Devel/REPL/Plugin/DataPrinter.pm

@@ -24,7 +24,8 @@ around 'format_result' => sub {
    );
    if (@to_dump != 1 || ref $to_dump[0]) {
       if (@to_dump == 1) {
-         if ( overload::Method($to_dump[0], '""') ) {
+         if ( overload::Method($to_dump[0], '""')
+                and not exists $config{override_stringify}{ref $to_dump[0]} ) {
             $out = "@to_dump";
          }
          else {
@@ -75,6 +76,25 @@ C<use_prototypes> and C<return_value>.  Note that C<dataprinter_config> only
 applies to the printing that the REPL does; if you invoke C<p()> in your REPL
 session yourself, these settings are B<not> applied.
 
+=head2 Devel::REPL::Plugin::DataPrinter specific customization
+
+=over
+
+=item override_stringify
+
+If the reference being printed has a stringification overloaded method and you
+do not want to use it by default, you can configure an override:
+
+    $_REPL->dataprinter_config({
+      caller_info => 0,
+      override_stringify => {
+        'DateTime' => 1,
+      },
+    });
+
+=cut
+
+
 =head1 SEE ALSO
 
 * L<Devel::REPL>