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# multiplatform

[Slackbot]

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[russhwolf]

You can do expect class Grade : GradeInterface where GradeInterface has your default implementations

[russhwolf]

And specifically for compareTo. you could do and extension function operater fun Grade.compareTo()

[russhwolf]

There's also https://youtrack.jetbrains.com/issue/KT-20427 around this functionality