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@___discovery Not sure how relevant this is for you but YAML has "anchors" and "aliases": yaml.org/spec/1.2/spec.html#alias// It's not quite clear though whether those are supposed to be duplicated or left as unique elements when parsing.
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@___discovery the fact that you need to use a "merge operator" (<<) to extend a recalled alias suggests to me that the alias carries the identity of the original rather than representing a mutable copy but I cannot find much on usage without the <<.