Hash structure

• Here's the real hash structure

    struct xpvhv {
      char * xhv_array; /* pointer to malloced string */
      STRLEN xhv_fill;  /* how full xhv_array currently is */
      STRLEN xhv_max;   /* subscript of last element of xhv_array */
      IV     xhv_keys;  /* how many elements in the array */
      NV     xnv_nv;    /* numeric value, if any */
      MAGIC* xmg_magic; /* magic for scalar array */
      HV*    xmg_stash; /* class package */
    
      I32    xhv_riter; /* current root of iterator */
      HE     *xhv_eiter;/* current entry of iterator */
      PMOP   *xhv_pmroot;/* list of pm's for this package */
      char   *xhv_name; /* name, if a symbol table */
    };