Line item Liquid property: parent_relationship

I’m looking to use the new ‘nested’ line item functionality released last week, but can’t find any documentation concerning line_item.parent_relationship - if I output it I get a ‘ParentRelationshipDrop’, but what are the properties of this object?

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Dawn has some further clues, and shows parent is one property - see dawn/snippets/cart-drawer.liquid at 5cd1a859751a5fc00e4dd8cf048ee8a67c4bb356 · Shopify/dawn · GitHub

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A lot more information here and in Horizon repo.

You can use parent_relationship.parent.key.

Also the dev assistant seems to know more than the docs, about this specific prop.

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