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The underlying problem is that JavaScript has poor support for data. Data structures should have immutable definitions and not be extendable (no inheritance). We use Objects to store data because we have no other choice. The Records and Tuples proposal should give us more options hopefully.
Rather than calling it "broken", you might identify additional reasons why it must be that way, such as TS lacking exact types (which could prevent extra keys via structural compatibility) and lacking sealed classes (which could prevent extra keys from inheritance).
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