You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tree.go
    path of file: ./repos/graphjin/core/internal/jsn
    
    the code of the file until where you have to start completion: package jsn

import (
	"bytes"
	"encoding/json"
)

func Tree(v []byte) (map[string]json.RawMessage, bool, error) {
	dec := json.NewDecoder(bytes.NewReader(v))
	array := false

	// read open bracket

	for i := range v {
		if v
    
func Tree(v []byte) (map[string]json.RawMessage, bool, error) {
	dec := json.NewDecoder(bytes.NewReader(v))
	array := false

	// read open bracket

	for i := range v {
		if v[i] != ' ' {
			array = (v[i] == '[')
			break
		}
	}

	if array {
		if _, err := dec.Token(); err != nil {
			return nil, false, err
		}
	}

	// while the array contains values
	var m map[string]json.RawMessage

	// decode an array value (Message)
	err := dec.Decode(&m)
	if err != nil {
		return nil, false, err
	}

	return m, array, nil
}