Note that one of the ways this could be a compat problem in practice is that (although it's obscure) some developers / libraries know to [use a pattern like this](https://github.com/heycam/webidl/issues/107) to feature-detect support for dictionary members. From a quick skim I think this could be used today on Chrome to detect, for example, when some fields are being parsed and when they're not. If sites depended on that, it could become a compat problem to change it.
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