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kotlinlang

<@U0BLPSJAK> The former should work (after rename it is going to be `expect class X` + `actual typealis X = java.lang.X`). The later with an actual extension replacement for the expected final method does not work (and will be tricky to make it work). What you should do is define expected extension in common code `expect fun X.method()` and then the provide the actual code for each platform, which can be a simple delegate to the member fun if it exists on that platform.