• Version: v11.2.0
• Platform: Darwin iMac.local 18.2.0 Darwin Kernel Version 18.2.0: Thu Dec 20 20:46:53 PST 2018; root:xnu-4903.241.1~1/RELEASE_X86_64 x86_64
• Subsystem:

When setting a file mode to 444 using chmodSync, then trying to copy another file over it, on Windows and on Linux, copyFile will throw an error, but on a Mac it does not, and it will override the file

fs.chmodSync(dest, '444');
// then try to 
fs.copyFile(source, dest, function (err) {
    // 	i do expect an err here, 
   // but there is no error on Mac
});

i even check the stat.mode using parseInt(fs.statSync(dest).mode.toString(8), 10) and it does in fact say 100444

This is a sample when everything is working well
https://repl.it/repls/CylindricalGlisteningCondition

However, when i run it on my mac, I get this

This platform is darwin
fs.stat.mode ./dest: 100444
/Users/akhoury/rcloned/code/NodeBB/rrr.js:26
                throw new Error(`This should've thrown an error!`);
                ^

Error: This should've thrown an error!

Thanks