Node fs.copyfileSync hangs when source and destination are identical

Version: v10.15.3
Platform: 4.15.0-46-generic debugger: use requireRepl() to load debugger repl #49~16.04.1-Ubuntu x86_64
Subsystem: fs

Unless the fs.constants.COPYFILE_EXCL flag is passed, when source and destination are the same, Node hangs forever.

const fs = require('fs'); 

fs.writeFileSync('foo', 'Hello World!');
fs.copyFileSync('foo', 'foo');

//Never reach here
console.log('Done');