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Because I would rather write one generic container library than n slightly different ones for each data type of deal with screwing around with casting interfaces?

This sounds good in theory. What about practice? Could you provide a few links to popular Go packages, which benefit from using generics?

Because it's extremely useful to have adaptable data structures, without byzantine code generation?

Could you provide links to a few Go packages, which implement useful generic-based data structures?

Try google.

Because they’re not useless.

Thanks for very strong argument :)

No weaker than yours :)