This might be a stupid question but I cannot figure an effective way to google it and have not been able to find the answer any other way. Maybe this is something that everyone else knows so please be kind.
What's with the ! that I see in this code base?
(I know that this is now handled automatically but it's an example I remember.)
What does the exclamation point mean? Is this an idiom that exists elsewhere? Can you point me to documentation?