Add SvIsBOOL() macro to test for SVs being boolean-intent

These are identified as being static shared COW strings whose string
buffer points directly at PL_Yes / PL_No

Define sv_setbool() and sv_setbool_mg() macros

Use sv_setbool() where appropriate

Have sv_dump() annotate when an SV's PV buffer is one of the PL_(Yes|No) special booleans

1 files changed, 1 insertions, 1 deletions

diff --git a/pp_hot.c b/pp_hot.c
index 43c61bd272..acb2616dda 100644
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -1083,7 +1083,7 @@ PP(pp_multiconcat)
                     if (!SvOK(right)) {
                         if (ckWARN(WARN_UNINITIALIZED))
                             report_uninit(right);
-                        sv_setsv_flags(left, &PL_sv_no, 0);
+                        sv_setbool(left, FALSE);
                     }
                     else
                         sv_setsv_flags(left, right, 0);