Array Differentiation

[Davider]

I need to get the type of the array variable passed in. Is this possible? Alternatively, are there any other solutions?
The following code will show an error

Macro Macro29

Code:

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ARRAY(str) as; out sub.f(as)
ARRAY(str) ai; out sub.f(ai)

#sub f
function~ `arg

sel GetArrayType(arg)
,case VT_I4; ret "int[]"
,case 256; ret "string[]"