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What’s the difference between something being defined in the scala package object and in Predef?
Is Predef just a relic from pre-2.8 when package objects didn’t exist, or is there some other reason why we need both?
According to the ScalaDoc,
So, it is not a package object itself, but acts as one in terms of providing functionality to “all Scala compilation units”
As for why the situation exists, I think you are right, looks to be a legacy issue
As for why it persists, there may continue to be limitations of package objects that prevent PreDef from being merged.