This for example, ain't no dang good complains about 'Expected Input Type' when something tries to parse the IDL ?

type ItemFilter {
  AND: [item]
  OR: [item]
  NOT: [item]
}

type Query { 
  # End point for lists of items 
  allItems(
    filter:ItemFilter
    sort: SortOptions
    take:Int
    skip:Int