TypeError: BigInt is not a constructor

[niloc132]

The elemental2.core.BigInt class exposes a constructor, but one that cannot be called without a runtime error.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt

Note: BigInt() can only be called without new. Attempting to construct it with new throws a TypeError.

https://tc39.es/ecma262/multipage/numbers-and-dates.html#sec-bigint-constructor

The BigInt constructor:
...
is not intended to be used with the new operator or to be subclassed. It may be used as the value of an extends clause of a class definition but a super call to the BigInt constructor will cause an exception.

Currently generated code in 1.2.3:

@JsType(isNative = true, namespace = JsPackage.GLOBAL)
public class BigInt {
  //...

  public BigInt(BigInt.ConstructorArgUnionType arg) {}

  public BigInt(JsBigint arg) {}

  public BigInt(String arg) {}

  public BigInt(double arg) {}
  //...
}

Arguably this is a closure-compiler externs issue, but I'm unclear how externs would define this type to have a prototype and methods, but the "constructor" is just a function...