Why doesn't this expression work?

I use expression:
To convert clip's frame range to value falling into interval <0;1>. For some reason Fusion refuses to take the result for Width, Height etc. When I have it display it with Text() in Text+, it displays correct results. What's wrong with it?
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time/(GlobalOut-GlobalIn)
To convert clip's frame range to value falling into interval <0;1>. For some reason Fusion refuses to take the result for Width, Height etc. When I have it display it with Text() in Text+, it displays correct results. What's wrong with it?