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: map.go
    path of file: ./repos/corteza/extra/server-discovery/vendor/github.com/goccy/go-json/internal/decoder
    
    the code of the file until where you have to start completion: package decoder

import (
	"reflect"
	"unsafe"

	"github.com/goccy/go-json/internal/errors"
	"github.com/goccy/go-json/internal/runtime"
)

type mapDecoder struct {
	mapType                 *runtime.Type
	keyType                 *runtime.Type
	valueType               *runtime.Type
	canUseAssignFaststrType bool
	keyDecoder              Decoder
	valueDecoder            Decoder
	structName              string
	fieldName               string
}

func newMapDecoder(mapType *runtime.Type, keyType *runtime.Type, keyDec Decoder, valueType *runtime.Type, valueDec Decoder, structName, fieldName string) *mapDecoder {
	return &mapDecoder{
		mapType:                 mapType,
		keyDecoder:   
    
func (d *mapDecoder) DecodePath(ctx *RuntimeContext, cursor, depth int64) ([][]byte, int64, error) {
	buf := ctx.Buf
	depth++
	if depth > maxDecodeNestingDepth {
		return nil, 0, errors.ErrExceededMaxDepth(buf[cursor], cursor)
	}

	cursor = skipWhiteSpace(buf, cursor)
	buflen := int64(len(buf))
	if buflen < 2 {
		return nil, 0, errors.ErrExpected("{} for map", cursor)
	}
	switch buf[cursor] {
	case 'n':
		if err := validateNull(buf, cursor); err != nil {
			return nil, 0, err
		}
		cursor += 4
		return [][]byte{nullbytes}, cursor, nil
	case '{':
	default:
		return nil, 0, errors.ErrExpected("{ character for map value", cursor)
	}
	cursor++
	cursor = skipWhiteSpace(buf, cursor)
	if buf[cursor] == '}' {
		cursor++
		return nil, cursor, nil
	}
	keyDecoder, ok := d.keyDecoder.(*stringDecoder)
	if !ok {
		return nil, 0, &errors.UnmarshalTypeError{
			Value:  "string",
			Type:   reflect.TypeOf(""),
			Offset: cursor,
			Struct: d.structName,
			Field:  d.fieldName,
		}
	}
	ret := [][]byte{}
	for {
		key, keyCursor, err := keyDecoder.decodeByte(buf, cursor)
		if err != nil {
			return nil, 0, err
		}
		cursor = skipWhiteSpace(buf, keyCursor)
		if buf[cursor] != ':' {
			return nil, 0, errors.ErrExpected("colon after object key", cursor)
		}
		cursor++
		child, found, err := ctx.Option.Path.Field(string(key))
		if err != nil {
			return nil, 0, err
		}
		if found {
			if child != nil {
				oldPath := ctx.Option.Path.node
				ctx.Option.Path.node = child
				paths, c, err := d.valueDecoder.DecodePath(ctx, cursor, depth)
				if err != nil {
					return nil, 0, err
				}
				ctx.Option.Path.node = oldPath
				ret = append(ret, paths...)
				cursor = c
			} else {
				start := cursor
				end, err := skipValue(buf, cursor, depth)
				if err != nil {
					return nil, 0, err
				}
				ret = append(ret, buf[start:end])
				cursor = end
			}
		} else {
			c, err := skipValue(buf, cursor, depth)
			if err != nil {
				return nil, 0, err
			}
			cursor = c
		}
		cursor = skipWhiteSpace(buf, cursor)
		if buf[cursor] == '}' {
			cursor++
			return ret, cursor, nil
		}
		if buf[cursor] != ',' {
			return nil, 0, errors.ErrExpected("comma after object value", cursor)
		}
		cursor++
	}
}