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> interfaces still can’t declare type-parameterized methods

What would an implementation look like? Wouldn't it be quite different from the existing one because it has to rely heavily on indirection because (limited) monomorphimization is not possible?

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Probably won't/cannot be ımplemented. C++ and Rust disallow the analogues of this (templated virtual methods/dyn with a trait containing methods taking type parameters) as well.

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