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They do not claim to have migrated 50 million lines of Ruby. Simply that some migration took place in such a codebase.
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Converted all the tabs to spaces? :-)

You are right, this is not a rewrite like the Bun case.

The real news is, at 50M LOC, it is able to handle and do _something_ coherent.

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Ok, so Stripe migrated their 50MLOC codebase from Ruby to Rust? Because that's what Bun did.
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