Dear Julia Experts, please, what’s wrong with the following? Can’t I make a vector that is a union of two different numerical types, i.e. a vector of either `Int64`

or ` Float64`

elements?

```
IntFloat = Union{Int64, Float64}
function fun(x::Vector{IntFloat})
println(x)
end
fun(Int64[1, 2, 3])
fun(Float64[1, 2, 3])
```