package main

import (
	"encoding/json"
	"fmt"
	goccy "github.com/goccy/go-json"
	"log"
)

func main() {

	rawData := []byte(`{"steps": [{"config":{"message": "Fail 
<"}}]}`)

	type config struct {
		Steps []struct {
			Config json.RawMessage `json:"config"`
		}
	}

	v1 := config{}

	if err := json.Unmarshal(rawData, &v1); err != nil {
		log.Fatal(err)
	}

	dataFromSTD, err := json.Marshal(v1) // {"Steps":[{"config":{"message":"Fail \u2028\u003c"}}]}
	if err != nil {
		log.Fatal(err)
	}

	v2 := config{}
	if err := goccy.Unmarshal(rawData, &v2); err != nil {
		log.Fatal(err)
	}

	// https://github.com/goccy/go-json/blob/master/internal/encoder/compact.go#L208
	dataFromGOCCY, err := goccy.Marshal(v1) // panic: runtime error: slice bounds out of range [23:21]
	if err != nil {
		log.Fatal(err)
	}

	if string(dataFromSTD) == string(dataFromGOCCY) {
		fmt.Println("OK")
		return
	}

	log.Fatal("diff")
}