MarshalFunc and dynamic reflect.Type

[torbenschinke]

I tried to adapt my enum package to the new v2 API, but I'm currently stuck on the json functions that only supports generic type parameters for defining custom marshalers/unmarshalers. Due to the dynamic discovery via reflect.Type, I can't instantiate the corresponding generic types.

It would only take a simple additional one-liner to also support a non-generic variant — similar to how the reflect package provides both TypeFor[T] and TypeOf(any).

[dsnet]

Hi, I recommend filing a proposal at https://github.com/golang/go/issues with the suggested API and tagging golang/go#71497 as the parent issue. Since this is API that could be added after the initial release of v2, I suspect that it will not be considered initially.

It seems to me that would need at least 4 additional functions to support this, which is somewhat unfortunate.

[torbenschinke]

Thanks for the response. I’ve opened a proposal at golang/go#73457.