"Microsoft Excel has stopped working" just on using IsMissing(copy from non init array) !

I nailed the bug in MS-Excel 2010 down to this simple code:

Don't know if it is only in my Excel 2010 - 64bit, Windows 7 (win7-x64)

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It is solved when adding () in the Dim ... copyVar() As Variant. But for some reason, hard to explain here, I want to use that copyVar also to hold non array's, so I don't want to use ()
Nevertheless "IsMissing" shouldn't raise a fatal-error, right!?

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I know ;-) I though I solved it and also wrote that I did found a solution. Well, not really solved the bug, but found a way not to have it.
But here's a question that I can't seem to solve:

I want a routine that actual clones a variable what ever it is, String, Object or even that un-allocated array. But as soon as one uses IsMissing() on that cloned un-allocated array the fatal error "Microsoft Excel has stopped working" closes Excel!

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thanks