Go で大規模な JSON 配列を効率的にストリーミングおよびデコードするにはどうすればよいですか?

package main

import (
    "encoding/json"
    "fmt"
    "log"
    "strings"
)

func main() {
    const jsonStream = `
                [
                    {"Name": "Ed", "Text": "Knock knock."},
                    {"Name": "Sam", "Text": "Who's there?"},
                    {"Name": "Ed", "Text": "Go fmt."},
                    {"Name": "Sam", "Text": "Go fmt who?"},
                    {"Name": "Ed", "Text": "Go fmt yourself!"}
                ]
            `

    type Message struct {
        Name, Text string
    }

    dec := json.NewDecoder(strings.NewReader(jsonStream))

    // Read the opening bracket.
    t, err := dec.Token()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%T: %v\n", t, t)

    // Loop through the array elements.
    for dec.More() {
        var m Message

        // Decode the current element.
        err = dec.Decode(&m)
        if err != nil {
            log.Fatal(err)
        }

        fmt.Printf("%v: %v\n", m.Name, m.Text)
    }

    // Read the closing bracket.
    t, err = dec.Token()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%T: %v\n", t, t)
}