Literal of ES2020 Violates the Principle of Unique

[clhiker]

The type of Literal of ES2020 is same as type of ES5, which violates the principle of uniqueness.
I found this problem when I used the uniqueness principle to resolve non-terminators backward compatible

[JLHwung]

The type of Literal of ES2020 is same as type of ES5

Yes, this is how we extend current AST nodes. I don't think it violates the principle of uniqueness. On the contrary, the Literal type is an important example of uniqueness.

when I used the uniqueness principle to resolve non-terminators backward compatible

Can you elaborate?