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#define SVf_IOK         0x00000100  /* has valid public integer value 
+*/
#define SVf_NOK         0x00000200  /* has valid public numeric value 
+*/
...
#define SVp_IOK         0x00001000  /* has valid non-public integer va
+lue */
#define SVp_NOK         0x00002000  /* has valid non-public numeric va
+lue */
#define SVp_POK         0x00004000  /* has valid non-public pointer va
+lue */