To achieve usable performance, every major runtime has resorted to non-standard internal optimizations for Web streams. Node.js, Deno, Bun, and Cloudflare Workers have all developed their own workarounds. This is particularly true for streams wired up to system-level I/O, where much of the machinery is non-observable and can be short-circuited.
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TeX can recurse via macro expansion, but there is no call stack, no local variables, and deep recursion risks hitting engine limits. So the search uses three explicit loop levels, one for each depth:
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