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It was not accurate. Placeholders could be used in outputs that are defined in the same mapping as long as that placeholder does not do the same. A more general solution would be to detect it at run-time in the replacer directly, but that's a bit tedious and will require allocations I think. A better implementation of this check could still be done, but I don't know if it would always be accurate. Could be a "best-effort" thing? But I've also never heard of an actual case where someone configured infinite recursion...