Everything inside an `expect class` is implicitly ...

# multiplatform

[russhwolf]

Everything inside an expect class is implicitly also an expect declaration. So I think you’d need to leave it undefined and implement it as an actual. Or you might be able to do it as an extension property on BigInteger.Companion if you don’t want to define it for each platform.

[Robert]

BigInteger.Companion cannot be resolved, after the tyealias