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Another hot topic is studying whether a codebase matches a specification or not, or if one spec is a more detailed version of another. I've not done a lot of this but I know @dominiktornow.bsky.social has a three step process: formal spec to more-detailed formal spec to implementation code
Another person to talk to would be @bugarela.com— her Quint language is supposedly very good at bridging the code-spec gap