Base64 should encode bytes rather than string representation of int64

[jiaoyuedave]

func main() {

	// Create a new Node with a Node number of 1
	node, err := snowflake.NewNode(1)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Generate a snowflake ID.
	id := node.Generate()

	// Print out the ID in a few different ways.
	fmt.Println(id)
	fmt.Println(id.Base64())
	b := id.IntBytes()
	fmt.Println(base64.StdEncoding.EncodeToString(b[:]))
}

result:

-129775853767749632
LTEyOTc3NTg1Mzc2Nzc0OTYzMg==
/jLxjG/AEAA=

dig into souce, i found that base64 method use string representation of int64 for encoding, which make no sense:

// Base64 returns a base64 string of the snowflake ID
func (f ID) Base64() string {
	return base64.StdEncoding.EncodeToString(f.Bytes())
}

// Bytes returns a byte slice of the snowflake ID
func (f ID) Bytes() []byte {
	return []byte(f.String())
}

it only make representation much longer.

[bwmarrin]

Thanks for the report, and good catch on this. Let me look at it and decide what we can do.