I agree about Go. One quite frustrating scenario I have ran into multiple times is if you unmarshal (parse) some JSON into a struct, you can’t tell if an intege

I agree about Go. One quite frustrating scenario I have ran into multiple times is if you unmarshal (parse) some JSON into a struct, you can’t tell if an integer field with value 0 was specified in the JSON input as 0, or missing from the input. AKA there’s no way to differentiate the zero value from undefined for primitives. There are roundabout hacky ways like parsing the JSON into a map[string]any to check if it’s there, but it’s so ugly and requires so many lines of code.