QAbstractItemModel::match bug?

[Koyi]

I found the problem (not the solution)

QAbstractItemModel::match compares each value from the model with the searched value and return the indexes that match.
it uses the operator== method of QVariant, but it doesn't work fine

my table is table.PNG

QVariant var1=QVariant(0); // variant containing the integer 0
 
QSqlQueryModel *miConsulta=new QSqlQueryModel;
 
miConsulta->setQuery("Select Valor, Descripcion From myTable");
QVariant var2=miConsulta->record(0).value(0);

QVariant var1=QVariant(0); // variant containing the integer 0

QSqlQueryModel *miConsulta=new QSqlQueryModel;

miConsulta->setQuery("Select Valor, Descripcion From myTable");
QVariant var2=miConsulta->record(0).value(0);

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I get
var1
value: 0
type: QVariant(int)
isnull: false

var2
value:0
type: QVariant(int)
isnull: true

but var1==var2 return TRUE !!!!!!!!!

how can a null variant be equal to anything?????????
can somebody explain?
thank's