Go runtime does not allow type assertions to raw CFN resource types

[arnogeurts-sqills]

🐛 Bug Report

Affected Languages

• TypeScript or Javascript
• Python
• Java
• .NET (C#, F#, ...)
• Go

General Information

• JSII Version: v1.52.1

What is the problem?

func main() {
	app := awscdk.NewApp(nil)
	stack := awscdk.NewStack(app, jsii.String("dummy"), &awscdk.StackProps{})
	lambdaFunction := awslambda.NewFunction(stack, jsii.String("dummy-function"), &awslambda.FunctionProps{
		FunctionName: jsii.String("dummy-function"),
		Code:         awslambda.Code_FromBucket(awss3.Bucket_FromBucketName(stack, jsii.String("dummy-bucket"), jsii.String("bucket-name")), jsii.String("dummy-object-key"), nil),
		Handler:      jsii.String("main"),
		Runtime:      awslambda.Runtime_PROVIDED_AL2(),
	})
	_ = lambdaFunction.Node().DefaultChild().(awslambda.CfnFunction)
}

This code panics, because the default child is actually a jsiiProxy_IConstruct. However, I would expect this code to work, as it does in other languages like typescript:
https://stackoverflow.com/questions/59411734/add-conditions-to-resources-in-cdk

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