Generates incorrect code for array parameter with uniqueItems set to true

[dalewking]

We have a parameter defined as follows where it takes a set of UUIDs:

    {
      "name" : "timeOffRequestIds",
      "in" : "body",
      "required" : true,
      "schema" : {
        "type" : "array",
        "items" : {
          "type" : "string",
          "format" : "uuid"
        },
        "uniqueItems" : true
      }
    }

The parameter to the API is declared as a Set due to the uniqueItems:

 timeOffRequestIds: kotlin.collections.Set<kotlin.String>

But the code to serialize is trying to use ListSerializer:

 _json.encodeToString(ListSerializer(kotlin.String.serializer()), timeOffRequestIds)

That should be using SetSerializer, not ListSerializer

[Alex009]

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