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Nothing deeply complicated in here, just a bunch of error plumbing, error code and check consolidation, double checks of internal logic, renames and comment gardening.
The most annoying parts of this PR are the bad errors we get from "anything going wrong during ScVal conversion" which is already noted as bug #1046 which I would love to fix but we probably don't have time; or at least last time I tried I gave up because it required too much SDK proc-macro hacking and error routing. Maybe I can try again sometime?