[BUG] runtime error: slice bounds out of range [23:21] while escaping

[alexey-slivkin]

Problem: panic while escaping.

Example:

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")
}

Original:
main.txt

Result:

panic: runtime error: slice bounds out of range [23:21]

goroutine 1 [running]:
github.com/goccy/go-json/internal/encoder.compactString({0x140000e6000?, 0x0?, 0x220000000000?}, {0x140000da060, 0x19, 0x30}, 0x400?, 0x1)
        /Users/test/projects/goccy-test/vendor/github.com/goccy/go-json/internal/encoder/compact.go:208 +0x6a8

Expected result:

OK

It seems this problem is being solved in https://github.com/goccy/go-json/pull/479/files