Inconsistent behavior with readable stream event "readable" in different versions of Node #31464

• Version:
  12.14.1, 10.18.1
• Platform:
  Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64 x86_64
• Subsystem:
  stream

Minimal example:

// index.js

const { Transform } = require("stream");

const stream = new Transform({
  transform(chunk, encoding, cb) {
    this.push(JSON.parse(chunk.toString()));
    cb();
  },
  writableObjectMode: false,
  readableObjectMode: true
});

stream.on("readable", () => {
  const data = stream.read();
  console.log("data", data);
});

stream.end(Buffer.from(JSON.stringify({ foo: "bar" })));

$ nvm use 12.14.1
Now using node v12.14.1 (npm v6.13.4)
$ node index
data { foo: 'bar' }
data null

$ nvm use 10.18.1
Now using node v10.18.1 (npm v6.13.4)
$ node index
data { foo: 'bar' }

$ nvm use 8
Now using node v8.11.3 (npm v5.6.0)
$ node index
data { foo: 'bar' } object
data null

It looks like in Node 10, there is only one readable event emitted when the stream is ended with data, whereas in Node versions 8 and 12, there is one readable emitted for the new data, and one with null to mark the end of the stream.

Is Node 10 also supposed to be emitting null as well when the stream closes?