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We're never going to know how much it cost and how many hours of engineering time it took behind the scenes.

GitHub commits, PRs and issues are public. even their recent buildkite CI logs are public.

apparently there's some kind of automated differential fuzzer to discover Node.js incompatibilities, but probably that's behind the curtain.

We might never know the exact dollars and cents amount, but we can make pretty well calibrated guesses.

I'd estimate based on those it cost at least a million bucks.