Using maxTimeMS & Javascript can lead to different errors from the server

In the shell: var t = db.max_time_ms; t.drop(); t.insert([{},{},{}]); t.getDB().adminCommand({configureFailPoint: "maxTimeAlwaysTimeOut", mode: "off"}).ok;   cursor = t.find({$where: function() { sleep(100); return true; }}).maxTimeMS(100); // Returns error: { "$err" : "JavaScript execution terminated", "code" : 16712 }   // Turn on a fail point t.getDB().adminCommand({configureFailPoint: "maxTimeAlwaysTimeOut", mode: "alwaysOn"}).ok; cursor = t.find({$where: function() { sleep(100); return true; }}).maxTimeMS(100); // Returns error: { "$err" : "operation exceeded time limit", "code" : 50 }