christy13/6006psets_ng — comment on commit b3620c9d94c0ca8758b37a7165dafe7b5ad2bff0
File: 5/code/rsa/big_num_full.rb line 36
By pwnall:

`!` means dangerous. It can mean the receiver is mutated, the arguments aren't checked, or that the method hits a remote server and is likely to take a long time to complete. Or something else that I haven't thought about.