Test for undefined in switch node?

I have seen references to using a switch and testing for 'is not null' as a way to determine if a variable is not undefined. Is this is not strictly correct. Is there a reason the switch node has no test for undefined or not undefined then?

The switch node has an option to test undefined

a-1

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Thanks. You saved me that @Andrei . I was replying and you got in first.

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Nice, thank you very much.

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