Interesting Find - ByRef Mismatch - Integer vs Byte

[some1uk03]

Just found an interesting situation here.....

Assuming we have this simple Sub:

Private Sub simpleTest(index As Integer)
  MsgBox index, vbOKOnly
End Sub

Private Sub Form_Load()
Dim mBox As Byte
simpleTest mBox     '//This gives a byRef error as the mBox variable is a Byte and expecting an Integer.
simpleTest (mBox)   '//This in brackets however, seems ok

End Sub

I'm assuming that the brackets is changing the variable type to a varient ?