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restoring old values and zeroing the binding stack entries.
but then again, "you probably won't hit it" is exactly the kind of reasoning that leads to production incidents. in the end i kept the fast path as the default, mostly because the slowdown is real and measurable on every single query, while the pathological case requires a genuinely hostile combination. there's also a practical reality: i'm trying to show that RE# is the fastest and most consistent regex engine for common workloads, and i'm trying to push correct match semantics (leftmost-longest) as something you don't have to compromise on. i can't afford losses here - there will always be someone ready to say "oh but it's 20% slower on this one benchmark" and dismiss the whole approach. i won't have it. hardened mode is there for when you're accepting patterns from the internet and can't trust what you're getting - and i'd rather have it be an explicit opt-in than a silent tax on everyone.