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: codec.go
    path of file: ./repos/scs
    
    the code of the file until where you have to start completion: package scs

import (
	"bytes"
	"encoding/gob"
	"time"
)

// Codec is the interface for encoding/decoding session data to and from a byte
// slice for use by the session store.
type Codec interface {
	Encode(deadline time.Time, values map[string]interface{}) ([]byte, e
    
func (GobCodec) Decode(b []byte) (time.Time, map[string]interface{}, error) {
	aux := &struct {
		Deadline time.Time
		Values   map[string]interface{}
	}{}

	r := bytes.NewReader(b)
	if err := gob.NewDecoder(r).Decode(&aux); err != nil {
		return time.Time{}, nil, err
	}

	return aux.Deadline, aux.Values, nil
}