Regression in v20.4.0, some unicode characters no longer supported in file names #48813

Version

v20.4.0

Platform

Windows NT 10.0.19043.0 x64

Subsystem

fs

What steps will reproduce the bug?

Code:

const fs = require('fs');
const name = String.fromCodePoint(0x1F525);
fs.writeFileSync(name, '');

Results:

> node-v18.16.1 test.js

> node-v20.4.0 test.js
node:internal/fs/utils:351
    throw err;
    ^

Error: ENOENT: no such file or directory, open '🔥'

How often does it reproduce? Is there a required condition?

Consistently.

What is the expected behavior? Why is that the expected behavior?

Create an empty file with the given name.

What do you see instead?

An error.