NULL
NULL (only --)
POST DEC
NULL
PRE DEC
NULL
Empty string
POST INC
string(0) ""
POST DEC
string(0) ""
PRE INC
string(1) "1"
PRE DEC
int(-1)
Non fill ASCII (only ++)
POST INC
string(4) " ad "
PRE INC
string(4) " ad "
Bool
POST INC
bool(false)
POST DEC
bool(false)
PRE INC
bool(false)
PRE DEC
bool(false)
POST INC
bool(true)
POST DEC
bool(true)
PRE INC
bool(true)
PRE DEC
bool(true)