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Both C# and Java have taken different approaches to constrained generics that are still really useful for about...I dunno, the 90% case (C# has reified generics and so it's more like 95%, but type erasure also has its pluses when you're off-roading around in a framework somewhere). Scala goes a little further and covers, like, the 99% case, and plenty of inadvisable ones too.

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