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example of trying to use it with the CF template:
```err := cloudformation.NewStack(ctx, "thing", &amp;cloudformation.StackArgs{
			TemplateUrl: pulumi.String(stack_5_3_1),
			Parameters: pulumi.StringMap{
				"Subnets":                   subnetsIDs, // this isn't a valid type for StringMap

			},
		})```

oh, I think.. this is the All() use case.

gross?

but kinda works?
```func Join(args []interface{}, sep string) pulumi.StringOutput {
	// gross? but works?
	format := strings.TrimSuffix(strings.Repeat("%s,", len(args)), ",")
	return pulumi.Sprintf(format, args)
}```