I wish the concept of dev mode and prod mode were baked deeper into all language runtimes/libraries. e.g. before going to production with real users these case

I wish the concept of dev mode and prod mode were baked deeper into all language runtimes/libraries. e.g. before going to production with real users these cases should error as hard as possible, including potentially logging crashing the program to make the program errors super visible. Then in production it should largely log these things in error logs and keep chugging along. And not like an environment variable with conditions. Something as first class as changing the standard exception and fatal calls behaviors.