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kotlinlang

<@U33H6SB2B> was looking at the wrappers and noticed you added stuff like
```@file:JsQualifier(
    """({
    __type_plus_guard__: Object.setPrototypeOf({
        [Symbol.hasInstance](instance) {
            return typeof instance === 'bigint'
        }
    }, BigInt)
  })"""
)```
What does this end up doing, considering this is related to externals?

As result - you can use `as/is` with `BigInt` type

Thanks. But why using `JsQualifier` ? Is that an intended use?

&gt; But why using `JsQualifier` ?
Because it works :slightly_smiling_face:

&gt; Is that an intended use?
No :slightly_smiling_face:

But it allows to be aligned with future Kotlin implementation

Nearest example `Array` for which you need to use special checks

Common request - custom `as/is` for external types, but it doesn’t look like nearest future

How do you know what future implementation will be, is there a KEEP or an issue on YouTrack about this ?

We already have primitive types in stdlib with special `is` check

Current implementation of `BigInt` aligned with `String`