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TypeScript Excess Property Checking Is Bypassed Through Structural Assignment to useState

This component defines a typed form state and updates it through an intermediate variable rather than an inline literal.

REACT_MODULE // 0x42

interface UserForm {
name: string;
email: string;
}
const [form, setForm] = useState<UserForm>({ name: "", email: "" });
const payload = { name: "Alice", email: "a@x.com", role: "admin" };
setForm(payload);

Why does this code compile without a TypeScript error, despite payload having a role property not present on UserForm?

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