[AccessD] Input and return data type in VB

Hi list,
Just noticed a VB issue I haven't encountered before.
Say I want a function to receive two input parameters of type Byte and return a value of type Integer. I create a function like this:

Function SumNumbers(Number1 As Byte, Number2 As Byte) As Integer
   SumNumbers=Number1 + Number2
End Function

When testing the function I get this:
?SumNumbers(200,55) -> 255 (OK)
?SumNumbers(255,1) -> Run-time error 6 Overflow (??!!)

The last error isn't expected since the return type is declared as Integer.
I can prevent this behaviour by altering the function like this:
Function SumNumbers(Number1 As Integer, Number2 As Byte) As Integer
   SumNumbers=Number1 + Number2
End Function

In other words: I have to make room for the return type by declaring a sufficient large type for one or more of the input parameters.
This certainly looks like a bug to me. And the "solution" of course doesn't apply if I actually want to restrict the input parameters to Byte and make room for a return value exceeding Byte.
The same issue goes for other types, e.g. Integer as input type and Long as return type.
Any solution?
Asger