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I don't agree. The code may not do precisely what was intended but it is deterministic. If you understand the language, you can understand the code.

Yes, you understand what it says. You don't know what it should say, though. The code can't tell you that.

[Edit: "Better architecture, but bug-for-bug compatible" probably isn't the goal of the rewrite.]

> Better architecture, but bug-for-bug compatible" probably isn't the goal of the rewrite.

Why not? From there you proceed to fix the old bugs.