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;