If you create a property node for the array, when you select properties it allows you (for arrays) to select array element, and under that selection a selection for ClassID. The output of that indicates the class of the array element. A list of cooresponding numbers is at ClassID
The ClassID doesn't tell you what type of numeric, just whether it is a numeric, string, varient, etc.
I have make a mistake, my property node was generic when i take Tabl(strict), I found " ÉltTabl.IdClasse"
this is perfect