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: variant.go
    path of file: ./repos/kubernetes/vendor/github.com/godbus/dbus/v5
    
    the code of the file until where you have to start completion: package dbus

import (
	"bytes"
	"fmt"
	"reflect"
	"sort"
	"strconv"
)

// Variant represents the D-Bus variant type.
type Variant struct {
	sig   Signature
	value interface{}
}

// MakeVariant converts the given value to a Variant. It panics if v cannot be
// represented as a D-Bus type.
func MakeVariant(v interface{}) Variant {
	return MakeVariantWithSignature(v, SignatureOf(v))
}

// MakeVariantWithSignature converts the given value to a Variant.
func MakeVariantWithSignature(v interface{}, s Signature) Variant {
	return Variant{s, v}
}

// ParseVariant parses the given string as a variant as described at
// https://developer.gnome.org/glib/stable/gvariant-text.html. If sig is not
// empty, it is taken to be the expected signature for the variant.
func ParseVariant(s string, sig Signature) (Variant, error) {
	tokens := varLex(s)
	p := &varParser{tokens: tokens}
	n, err := varMakeNode(p)
	if err != nil {
		return Variant{}, err
	}
	if sig.str == "" {
		sig, err = varInfer(n)
		if err != nil {
			return Variant{}, err
		}
	}
	v, err := n.Value(sig)
	if err != nil {
		return Variant{}, err
	}
	return MakeVariant(v), nil
}

// format returns a formatted version of v and whether this string can be parsed
// unambiguously.
func (v Variant) format() (string, bool) {
	switch v.sig.str[0] {
	case 'b', 'i':
		return fmt.Sprint(v.value), true
	case 'n', 'q', 'u', 'x', 't', 'd', 'h':
		return fmt.Sprint(v.value), false
	case 's':
		return strconv.Q
    
func (v Variant) format() (string, bool) {
	switch v.sig.str[0] {
	case 'b', 'i':
		return fmt.Sprint(v.value), true
	case 'n', 'q', 'u', 'x', 't', 'd', 'h':
		return fmt.Sprint(v.value), false
	case 's':
		return strconv.Quote(v.value.(string)), true
	case 'o':
		return strconv.Quote(string(v.value.(ObjectPath))), false
	case 'g':
		return strconv.Quote(v.value.(Signature).str), false
	case 'v':
		s, unamb := v.value.(Variant).format()
		if !unamb {
			return "<@" + v.value.(Variant).sig.str + " " + s + ">", true
		}
		return "<" + s + ">", true
	case 'y':
		return fmt.Sprintf("%#x", v.value.(byte)), false
	}
	rv := reflect.ValueOf(v.value)
	switch rv.Kind() {
	case reflect.Slice:
		if rv.Len() == 0 {
			return "[]", false
		}
		unamb := true
		buf := bytes.NewBuffer([]byte("["))
		for i := 0; i < rv.Len(); i++ {
			// TODO: slooow
			s, b := MakeVariant(rv.Index(i).Interface()).format()
			unamb = unamb && b
			buf.WriteString(s)
			if i != rv.Len()-1 {
				buf.WriteString(", ")
			}
		}
		buf.WriteByte(']')
		return buf.String(), unamb
	case reflect.Map:
		if rv.Len() == 0 {
			return "{}", false
		}
		unamb := true
		var buf bytes.Buffer
		kvs := make([]string, rv.Len())
		for i, k := range rv.MapKeys() {
			s, b := MakeVariant(k.Interface()).format()
			unamb = unamb && b
			buf.Reset()
			buf.WriteString(s)
			buf.WriteString(": ")
			s, b = MakeVariant(rv.MapIndex(k).Interface()).format()
			unamb = unamb && b
			buf.WriteString(s)
			kvs[i] = buf.String()
		}
		buf.Reset()
		buf.WriteByte('{')
		sort.Strings(kvs)
		for i, kv := range kvs {
			if i > 0 {
				buf.WriteString(", ")
			}
			buf.WriteString(kv)
		}
		buf.WriteByte('}')
		return buf.String(), unamb
	}
	return `"INVALID"`, true
}