var FloatOperands = Type("FloatOperands", func() {
    Attribute("a", Float64, "Left operand")
    Attribute("b", Float64, "Right operand")
    Required("a", "b")
})

var IntOperands = Type("IntOperands", func() {
    Attribute("a", Int, "Left operand")
    Attribute("b", Int, "Right operand")
    Required("a", "b")
})