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281 /* the number of keys (including any placeholers) */
282 #define XHvTOTALKEYS(xhv)       ((xhv)->xhv_keys)
...


293 #define HvPLACEHOLDERS_get(hv)  (SvMAGIC(hv) ? Perl_hv_placeholder
+s_get(aTHX_ (const HV *)hv) : 0)

2536 I32
2537 Perl_hv_placeholders_get(pTHX_ const HV *hv)
...
2543 
2544     return mg ? mg->mg_len : 0;
2545 }

411 MAGIC*
412 Perl_mg_find(pTHX_ const SV *sv, int type)
...
421     }
422     return NULL;
423 }