Expression component reads Surface input as Boolean

Hi everyone! Got this issue when trying to use Surface as input for Expression component
Is it intentional?
Any suggestion how to fix it?

I think I would use a Stream Filter instead…

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Thanks! Working with GH only for a week and a half, didnt know about this component :slight_smile:

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No problem. I’d suggest reading the Modelab Grasshopper Primer.

And if the problem is solved, please click the Solution button. Thanks