Don't try to set the NV on a typeglob-in-action. Should cure bug

41920.

p4raw-id: //depot/perl@30659

diff --git a/sv.c b/sv.c
index 44b9122..51dffcb 100644 (file)
--- a/sv.c
+++ b/sv.c
@@ -1320,7 +1320,8 @@ Perl_sv_upgrade(pTHX_ register SV *sv, svtype new_type)
         * NV slot, but the new one does, then we need to initialise the
         * freshly created NV slot with whatever the correct bit pattern is
         * for 0.0  */
-       if (old_type_details->zero_nv && !new_type_details->zero_nv)
+       if (old_type_details->zero_nv && !new_type_details->zero_nv
+           && !isGV_with_GP(sv))
            SvNV_set(sv, 0);
 #endif