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      I tried to comment on the site, but it’s held up in the moderation queue ATM.

      type B A defines B as having the data of A, but not the methods. type B struct { A } will inherit the methods of A, and type B = A is just an alias for A, not a new type. So, type fishTank container[fish] should be type fishTank struct { container[fish] } since he wants to add a new method but inherit the old ones.

      The thing about comparable is a sprawling debate in the Go Github issues. Long story short, you can use an interface value as a map key in normal Go, but it will blow up if the concrete value behind the interface is incomparable. It is however forbidden in generic Go. Language developers are having a long debate about how to make this work consistently.