scala/scala — pull request #2401 by sschaef (2013-04-16 23:05:37+00:00)
Title: Remove unnecessary lower bounds on Eithers joinLeft and joinRight

Because <:< is contravariant in its first type parameter it is not
necessary that both type parameters of Either are lower bounded in
joinLeft and joinRight.

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I don't know if you want to have a ticket for this. If yes, just tell me and I create one.