LightInject multiple constructors

Been using LightInject for a while now and it has been great! Hit a snag trying to support multiple constructors of the same type, though. See the simplified example below. Foo has four constructors, differing by the type and number of arguments. I register one mapping per constructor. The first time I call GetInstance to retrieve an IFoo, it blows up with the following exception. What am I missing? How can I accomplish this functionality?

InvalidCastException: Unable to cast object of type 'LightInject.ServiceContainer' to type 'System.Object[]'.

Public Interface IFoo

End Interface

Public Class Foo
    Implements  IFoo

    Public Sub New()

    End Sub

    Public Sub New(name As String)

    End Sub

    Public Sub New(age As Integer)

    End Sub

    Public Sub New(name As String, age As Integer)

    End Sub

End Class


container.Register(Of IFoo, Foo)
container.Register(Of String, IFoo)(Function(factory, name) New Foo(name))
container.Register(Of Integer, IFoo)(Function(factory, age) New Foo(age))
container.Register(Of String, Integer, IFoo)(Function(factory, name, age) New Foo(name, age))

Dim f1 As IFoo = container.GetInstance(Of IFoo)()                     'BOOM!
Dim f2 As IFoo = container.GetInstance(Of String, IFoo)("Scott")
Dim f3 As IFoo = container.GetInstance(Of Integer, IFoo)(25)
Dim f4 As IFoo = container.GetInstance(Of String, Integer, IFoo)("Scott", 25)

You can use Typed Factories to cleanly accomplish this.

http://www.lightinject.net/#typed-factories

Imports LightInject

Namespace Sample
    Class Program
        Private Shared Sub Main(args As String())
            Console.WriteLine("Go")

            Dim container = New ServiceContainer()
            container.Register(Of FooFactory)()

            Dim fooFactory = container.GetInstance(Of FooFactory)()
            Dim f1 As IFoo = fooFactory.Create()
            Dim f2 As IFoo = fooFactory.Create("Scott")
            Dim f3 As IFoo = fooFactory.Create(25)
            Dim f4 As IFoo = fooFactory.Create("Scott", 25)

            Console.WriteLine("Stop")
            Console.ReadLine()
        End Sub
    End Class

    Public Interface IFoo

    End Interface

    Public Class Foo
        Implements IFoo


        Public Sub New()
        End Sub


        Public Sub New(name As String)
        End Sub


        Public Sub New(age As Integer)
        End Sub


        Public Sub New(name As String, age As Integer)
        End Sub

    End Class

    Public Class FooFactory

        Public Function Create() As IFoo
            Return New Foo()
        End Function

        Public Function Create(name As String) As IFoo
            Return New Foo(name)
        End Function

        Public Function Create(age As Integer) As IFoo
            Return New Foo(age)
        End Function

        Public Function Create(name As String, age As Integer) As IFoo
            Return New Foo(name, age)
        End Function
    End Class
End Namespace

Note, you can create an IFooFactory interface if you feel it adds value.