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I've had some success here with mergo
<https://github.com/imdario/mergo>

i last used it for kubernetes labels, but the same thing should apply, something like this

```tags := pulumi.StringMap{
  "app": pulumi.String(name),
}

additionalTags := pulumi.StringMap{
  "owner": pulumi.String(owner)
}

if err := mergo.Merge(&amp;tags, additionalTags, mergo.WithOverride); err != nil {
  if err != nil {
    return nil, err
  }
}```

Have you seen this article on tagging with transformations? <https://www.pulumi.com/blog/automatically-enforcing-aws-resource-tagging-policies/>

I have, thanks. It's a bit of overkill for my use case (single user, not a team of folks), I think.