#if PERL_VERSION <= 8
case SVt_PVBM: TAG;
total_size += sizeof(XPVBM);
-#if (PERL_VERSION < 11)
total_size += SvROK(thing) ? thing_size(aTHX_ SvRV(thing), st) : SvLEN(thing);
-#else
- total_size += SvLEN(thing);
-#endif
total_size += magic_size(thing, st);
TAG;break;
#endif