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kotlinlang

Legacy compiler backend generate JS objects with fields named exactly like data class property names.
For `data class Foo(val a: Int, val b: String)` we have `a` and `b` on the JS side. But new IR backend generates `_a` and `_b`.  I think it will break a lot of code. Is this intentional change?

It looks like I could use `@JsExport` on my data class, to get those properties back. But for now I cant't because of KT-39740 :disappointed:

Another option - external interface :slightly_smiling_face:

```external interface IFoo {
    val a: Int,
    val b: String 
}

data class Foo(...): IFoo```

I'm not able to stop the names from being mangled with `@JsExport` _or_ an external interface :thinking_face:

<@UFT11FKSP> see: <https://youtrack.jetbrains.com/issue/KT-41162>

I hope they will fix this. It gives me a lot of problems when I try to work with IR.