Comment by ADD-SP

The JSON RFC (https://datatracker.ietf.org/doc/html/rfc8259#page-6) doesn't require the unique entry name, and also the fact is that many parser uses the last-win strategy like serde_json.

For human, this is invalid, but many web services accepts this kind of JSON consciously or unconsciously.

I'm guessing this may have become a feature of some services and it's hard for maintainers to break this behavior. ᵕ︵ᵕ