Cannot unmarshal number into Go value of type []int32

[ivoras]

In an older version of go-pg, it was possible to do:

result := []int32{}
_, err := db.Query(&result, "SELECT intfield FROM mytable")

At some time this very intuitive syntax was disallowed and regressed into using pg.Scan() and others, so I converted it to:

result := []int32{}
_, err := db.Query(pg.Scan(&result), "SELECT intfield FROM mytable")

But that resulted in this error:

 json: cannot unmarshal number into Go value of type []int32 

I'm puzzled where does the "json" part of the message comes from? The goal is to get a column of integers into a []int32 slice.

Edit:

I'm overthinking it: reverting the code back to db.Query(&result, "SELECT...") apparently works. Is there some documentation which explains when pg.Scan() is needed and when it isn't?