REST Return Type

I have an Apex class that can be invoked from a REST Get :

@HttpGet

global static Set<Id> doGet() {

.......

}

However the compiler is complaining with:

Invalid type for Http* method: SET<Id>

Am I only allowed to return a concrete object type?

Nick00000
Yes this is mentioned in the Apex documenation in the section "Apex REST Methods"

You can't use a Set, but you can use a List instead.

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