http://www.perlmonks.org?node_id=924120


in reply to has RV gone in 5.12?

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;

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