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kotlinlang

I have a large old java (would-be data-class) class that I'd like to convert to use a sealed class hierarchy, but its large, and its fellow object under that sealed class hierarchy is also large. I can convert them both to kotlin and put them in the same file, but it would be a fairly large file. Are there any thoughts on loosening the "sealed class impls must be in the same file" to "sealed class impls must be _in the same compilation unit_"?