[TYPO3-Solr] index array result from USERfunc?

[Thomas Roediger]

hi There, 
is there a way to get the array result from a userfunc to get indexed as an array?
i.e.: 
test_intM = USER
test_intM{
   userFunc = MyExt\UserFunc->listOfUids
}

i tried with multivalue=1, but that does not change a thing. i made sure that UserFunc->listOfUids returns an array, but the result is allways 0 in solr. playing a bit with the dynamic type (stringM instead of intM) shows that array is not handled and indexed as "Array".

A hint would be great!

Best,
Thomas