Every time I feel I've come to terms with how Go works I round a corner and hit a wall, even after doing this for >5 years. Here's one.
Consider this simple code (https://go.dev/play/p/bph5I80vc99): package main import ( "encoding/json" "fmt" ) type S struct { Foo int } func update(v any) { if err := json.Unmarshal([]byte(`{"Foo": 42}`), &v); err != nil { panic(err) } fmt.Printf("%v %T\n", v, v) } func main() { var val S // map[Foo:42] map[string]interface {} update(val) // &{42} *main.S update(&val) } Why would calling by value change the type of the value passed to map? I would expect an interface with a dynamic type of main.S, but its map[string]interface{}, or json.Unmarshal makes it so. Insights appreciated :) -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/980466d2-1686-4b79-aec1-45b592db2caan%40googlegroups.com.
