I'm liking this next iteration on Go generics more:
go.googlesource.com/proposal/+/mas
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I don't like how they approached interfaces (i.e. not explicit interface contracts but rather structural matches) and prefer this approach, but I don't agree with having these as separate features. That doesn't make sense to me. It should be a unified system for different uses.
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I think that is largely due to the code compatibility guarantee. Maybe that wouldn't have been possible with an extension to interfaces?
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I would change "Why not use interfaces instead of contracts?" to "Why not use contracts instead of interfaces?" and throw away interfaces. I don't like how they did interfaces. It would be nicer to be able to use a subset of (methods in) contracts as dynamic objects instead.
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That's an interesting point. If they made contracts a strict superset of interfaces, new code could use contracts for the same purpose and interfaces could eventually be deprecated.
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I don't agree with a lot of the details / choices when considering it from a fresh language design perspective but of course there are a lot of backwards compatibility issues and existing design choices leading it to be this way. It's really not how I would approach this though.
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Primitive types and user-defined types being totally different and requiring totally different code to work with them is very ugly and makes me feel like I'm dealing with Java. This proposal doubles down on that instead of at least not making an existing problem any worse.
So, for example, with both the existing interfaces and these contracts (which I think should really be 1 feature) you end up needing to define wrappers, with everyone defining their own, and needing to implement these methods over and over again. I don't really understand it.
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There's serious a need for the standard library to define some basic contracts and provide wrappers around the built-in types so people can reuse those instead of making their own. However, this smells a lot like Java. I don't see any benefits from forcing both int and Integer.
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Unfortunately, golang seems to do this for built-in types and custom types (such as iteration using range and iteration using NewIterator).