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Compared to regular `Object`s there's a number of advantages to using `Map`s: - They support "proper" iteration. - They have a simple way to check for the existence of data. - They have a simple/efficient way to check the number of elements. If this functionality was added today, I cannot imagine that we'd choose an `Object` for this sort of data. Furthermore, in PR 21351 the data returned by `getAttachments` changed slightly and third-party users will need to update their code anyway (hence why `[api-minor]` should be fine here).