[datatable-help] dcast.data.table loses column classes when column is date

[Juan Manuel Truppia]

Here is a reproducible example

dcast.data.table(data = data.table(id = c(1,1,2,2), ty =
c("a","b","a","b"), da = Sys.Date()), formula = id ~ ty)

I don't know how to report a bug, if someone guides me, I'll be much obliged

Thanks!