nit: the `.toThrow(/[Ee]xcessive aliasing/)` assertion can pass for the wrong reason — the bomb pre-consumes ~16,759,547 of the 16,777,216 alias-expansion budget via hand-tuned magic numbers (18, 29), leaving only a ~0.1% margin, so any future tweak to `MAX_ALIAS_EXPANSION` or `charge_alias_expansion` node-counting will make `pad:` itself throw before the parser ever reaches the nested `{<<: ...}` section. Add `expect(() => YAML.parse(bomb.join("\n") + "\n")).not.toThrow()` before building `payl