I'm using Androidx Navigation as a router in my app, whereas I have a bunch of different routes, and one has some arguments of the shape: route?$sectionArg={$sectionArg}&itemId={$itemId}. For example, a route for this navigation destination could be: myapp://catalog?section=books&itemId=69

I want the itemId argument to be "optional", i.e. that is OK to navigate to a route of the shape:

myapp://catalog?section=books

But when I define the arguments, I have to do this:

composable(
    route = CatalogDestination.routeWithArgs,
    arguments = listOf(
        navArgument(CatalogDestination.sectionArg) {
            type = NavType.StringType
            defaultValue = "Books"
        },
        navArgument(PlantSheetDestination.usageArg) {
            type = NavType.IntType
            defaultValue = -1
        }
    ),

Because, if I don't set a defaultValue I get a Runtime Error, similar to this one:

java.lang.IllegalArgumentException: Deep link myapp://catalog?section=Books can't be used to open destination Destination(0x0).
                                                                                                    
Following required arguments are missing: [itemId]

Nor I can set that argument as nullable, because the IntType for NavArgument doesn't allow it. In fact:

navArgument(PlantSheetDestination.usageArg) {
    type = NavType.IntType
    nullable = true
}

Throws:

java.lang.IllegalArgumentException: integer does not allow nullable value

Note that I'm not using safe args.