4

e.g. a += b! - c!; I saw several expressions like this but I can't find what it's called or what it does

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6

you're telling the compiler that even though judging purely by the code, the variable could be undefined, you, the programmer, know for 100% sure that it will have a value, so you're not going to do a check to see if it has a value or not.

See playground example

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