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[fix] Always use RuntimeNothing and RuntimeNull types in method parameters and return types#4064
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…uit operations involving Nothing type. Fix genaration of cast-operation in ensureUnboxed
…imitive types to their boxed form
…as they were defined as Nothing / Null
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Fixes#4039
We're using incorrect signatures for methods having parameter or return types set to
NothingorNull- we should have always usedscala.runtime.Nothing$andscala.runtime.Null$instances. These are emitted by both JVM and Scala.js.This change breaks the binary compatibility of NIR. For backward compatibility, it adopts the signatures produced by the pre 0.5.6 compiler.
Due to broken forward compatibility it probably should not be merged in 0.5.x series and we should fix issue#4039 in some other way.