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-rw-r--r--lib/PublicInbox/InboxWritable.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/InboxWritable.pm b/lib/PublicInbox/InboxWritable.pm
index e684f546..ce979ea2 100644
--- a/lib/PublicInbox/InboxWritable.pm
+++ b/lib/PublicInbox/InboxWritable.pm
@@ -19,6 +19,7 @@ use constant {
 
 sub new {
         my ($class, $ibx, $creat_opt) = @_;
+        return $ibx if ref($ibx) eq $class;
         my $self = bless $ibx, $class;
 
         # TODO: maybe stop supporting this