```MongoClient.connect('mongodb://localhost/db?maxIdleTimeMS=100', (err) => {})``` will crash the running process.

"maxIdleTimeMS" is unsupported, but instead of just shutting down the process, it should probably emit a warning and dismiss the unsupported parameter, or try...catch and call the callback function with the error as first parameter.

The ```parse``` function throws in ```url_parser.js:234```.
The caller is ```mongo_client:289```

So my suggestion is :

• Emit a warning and ignore the parameter
• try...catch the call to that function in mongo_client.