nntpd: share {groups} hash with {-by_newsgroup} in Config

There's no need to duplicate a potentially large hash,
but we can keep the inexpensive shortcut to it.  We may
eventually drop the {groups} shortcut if it's no longer
useful.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index 251008a3..e7aea99b 100644
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -438,7 +438,9 @@ EOF
                 }
         }
         if (my $ng = $ibx->{newsgroup}) {
-                $self->{-by_newsgroup}->{$ng} = $ibx;
+                # PublicInbox::NNTPD does stricter (and more expensive checks),
+                # keep this lean for startup speed
+                $self->{-by_newsgroup}->{$ng} = $ibx unless ref($ng);
         }
         $self->{-by_name}->{$name} = $ibx;
         if ($ibx->{obfuscate}) {