readLines always yield empty "" at EOF?

[t829702]

Describe the bug A clear and concise description of what the bug is.

it seems Deno's readLines always yield empty "" at EOF, while all other known Programming languages' similar line scanning interfaces don't do this

import { readLines } from "https://deno.land/[email protected]/io/mod.ts";

for await (const line of readLines(Deno.stdin)) {
  console.log(new Date, 'got line:', { line });
}

To Reproduce Steps to reproduce the behavior:

$ seq 3 | deno run readlines-deno.js
2021-06-27T10:23:08.520Z got line: { line: "1" }
2021-06-27T10:23:08.522Z got line: { line: "2" }
2021-06-27T10:23:08.522Z got line: { line: "3" }
2021-06-27T10:23:08.522Z got line: { line: "" }

Expected behavior A clear and concise description of what you expected to
happen.

Node's builtin readline ::

const rl = readline.createInterface({
  input: process.stdin,
});

(async function () {
  for await (const line of rl) {
    console.log(new Date, 'got line:', { line });
  }
})()

$ seq 3 | node ./readline-node.js
2021-06-27T10:26:11.352Z got line: { line: '1' }
2021-06-27T10:26:11.357Z got line: { line: '2' }
2021-06-27T10:26:11.358Z got line: { line: '3' }

Go's example scanner lines https://golang.org/pkg/bufio/#example_Scanner_lines

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		fmt.Println(scanner.Text()) // Println will add back the final '\n'
	}
	if err := scanner.Err(); err != nil {
		fmt.Fprintln(os.Stderr, "reading standard input:", err)
	}
}

$ seq 3 | ./readlines-go
1
2
3

and Python:

$ seq 3 | python -c 'import sys;
for line in sys.stdin:
    print("line:", line)' 
('line:', '1\n')
('line:', '2\n')
('line:', '3\n')