Ambiguous reference for types with same name and different number of generic arguments

It seems boo cannot resolve generics when there are more than one instance of the generic type. For example, FSharp defines a lot of Tuples, which are simply Tuple<T1>, Tuple<T1,T2>, ...., Tuple<T1,T2,...T7>. Trying to use a Tuple of the second order gives the following:

import Microsoft.FSharp.Core from fslib.dll
t = Tuple[of int,int,int]()

ERROR: Ambiguous reference 'Tuple': Microsoft.FSharp.Core.Tuple`7, Microsoft.FSharp.Core.Tuple`6, Microsoft.FSharp.Core.Tuple`5, Microsoft.FSharp.Core.Tuple`4, Microsoft.FSharp.Core.Tuple`3, Microsoft.FSharp.Core.Tuple`2.

ERROR: 'Microsoft.FSharp.Core.Tuple`7' is not a generic definition.

I also tried a seventh order Tuple to see if Tuple`7 would work, but it didnt.