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.NET does a mixture of C++ and Java, meaning generic instatiations for value types get their own version of the code, instatiations for reference types get a shared version.

It's worth noting that in case of C#, it's really an implementation detail. It could just as well share all instantiations by boxing and adding a bunch of runtime checks - the language semantics wouldn't change because of it.

In C++, on the other hand, separate compilation of template for each instantiation is effectively part of language semantics, because it has numerous observable effects.

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