SvREFCNT_dec(keysv); /* sv_magicext() increases refcnt in mg_obj */
/* NOTE:
- * although we use MAGIC for gc, we also store mg to any slot for efficiency (gfx)
+ * although we use MAGIC for gc, we also store mg to CvXSUBANY slot for efficiency (gfx)
*/
CvXSUBANY(xsub).any_ptr = (void*)mg;