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: string_ascii.go
    path of file: ./repos/corteza/server/vendor/github.com/dop251/goja
    
    the code of the file until where you have to start completion: package goja

import (
	"hash/maphash"
	"io"
	"math"
	"reflect"
	"strconv"
	"strings"

	"github.com/dop251/goja/unistring"
)

type asciiString string

type asciiRuneReader struct {
	s   asciiString
	pos int
}

func (rr *asciiRuneReader) ReadRune() (r run
    
func (s asciiString) compareTo(other valueString) int {
	switch other := other.(type) {
	case asciiString:
		return strings.Compare(string(s), string(other))
	case unicodeString:
		return strings.Compare(string(s), other.String())
	case *importedString:
		return strings.Compare(string(s), other.s)
	default:
		panic(newTypeError("Internal bug: unknown string type: %T", other))
	}
}