Entity Server Exception using InList with Intersected IEnumerables

   Getting another exception when I execute a query that uses a predicate description built with a FilterOperator of InList when the list is an intersected set of lists:
RemoteExceptionDetails: 
System.ArgumentException: Invalid values for InList operation - Value must be of type: System.Collections.Generic.IList`1[System.Int32]
     at IdeaBlade.Linq.PredicateDescription.Validate()
     at IdeaBlade.Linq.PredicateDescription.Initialize(FilterOperator filterOp, Object value, Boolean ignoreCase)
     at IdeaBlade.Linq.PredicateDescription..ctor(Type instanceType, String propertyPath, FilterOperator filterOp, Object value, Boolean ignoreCase)
     at IdeaBlade.Linq.PredicateBuilder.Make(Type type, String propertyName, FilterOperator filterOp, Object value)

I have several queries that produce a set of distinct values and return their results into an IEnumerable<int>.  If I just use this one single list of values in the predicate description, it works fine but if I combine them via the Intersect operation, it throws the error.  All of these are server-side sync queries.

Take these obviously made-up queries to illustrate this against NorthwindIB:

// SQL
select Distinct ProductID from [Product] where UnitsInStock < 5 
intersect
select Distinct ProductID from [Product] where CategoryID < 5

// and now DevForce
IEnumerable<int> productsFromUnits;
IEnumerable<int> productsFromCategoryull;
IEnumerable<int> commonProducts;

var propSelector = new PropertyProjectionSelector(typeof(Product), "ProductID");

productsFromUnits = EntityQuery.Create(typeof(Product)).Where(x => x.UnitsInStock < 5).Select(propSelector).Distinct().Execute().Cast<int>());

productsFromCategory = EntityQuery.Create(typeof(Product)).Where(x => x.CategoryID < 5).Select(propSelector).Distinct().Execute().Cast<int>());

commonProducts = productsFromUnits.Intersect(productsFromCategory);

var p = PredicateBuilder.Make(typeof(Product), "ProductID", FilterOperator.InList, commonProducts);
var q = EntityQuery.Create(typeof(Product).Where(p);
var results = manager.ExecuteQuery(q);

Again, I'm using build 6.1.2.0c.