golang go-redis package, Why don't we use V8 to call packages when we refer to them?

Question

Consider package github.com/go-redis/redis/v8; its path ends with v8. So why, when we need to use function NewClient from that package, do we write redis.NewClient and not v8.NewClient?

package main

import (
    "github.com/go-redis/redis/v8"
)

func ExampleClient() {
    rdb := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // no password set
        DB:       0,  // use default DB
    })
    // do something with rdb
}