The types of SV in 5.10.0 (from sv.h): 

typedef enum {
    SVt_NULL,    /* 0 */
    SVt_BIND,    /* 1 */
    SVt_IV,        /* 2 */
    SVt_NV,        /* 3 */
    /* RV was here, before it was merged with IV.  */
    SVt_PV,        /* 4 */
    SVt_PVIV,    /* 5 */
    SVt_PVNV,    /* 6 */
    SVt_PVMG,    /* 7 */
    SVt_REGEXP,    /* 8 */
    /* PVBM was here, before BIND replaced it.  */
    SVt_PVGV,    /* 9 */
    SVt_PVLV,    /* 10 */
    SVt_PVAV,    /* 11 */
    SVt_PVHV,    /* 12 */
    SVt_PVCV,    /* 13 */
    SVt_PVFM,    /* 14 */
    SVt_PVIO,    /* 15 */
    SVt_LAST    /* keep last in enum. used to size arrays */
} svtype;

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As you can see, SVt_RV was removed. It was identical to SVt_IV, and removing it allowed the addition of a new type.

illguts doesn't reflect this change. Filed a bug report

In reply to Re: has RV gone in 5.12? by ikegami
in thread has RV gone in 5.12? by xiaoyafeng

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