初学golang通道尝试了如下代码：
```
package main
import (
"fmt"
"time"
)
type Sender chan<- int
type Receiver <-chan int
func main() {
var myChannel = make(chan int, (0))
var number = 6
go func() {
var sender Sender = myChannel
sender <- number // 1
sender <- number // 2
fmt.Println("Sent!") //5
}()
go func() {
var receiver Receiver = myChannel
fmt.Println("Received!", <-receiver) //3
}()
go func() {
var receiver Receiver = myChannel
fmt.Println("Received!", <-receiver) //4
}()
time.Sleep(time.Second)
}
```
定义了一个非缓存myChannel后，在1处应该阻塞了，然后执行了3处，这时候通道里没数据应该执行2处之后阻塞了再执行4处，最后回到5处。
但实际结果是：
Received! 6
Sent!
Received! 6
这是为什么啊？有大神给解释一下吗
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