I'd put that under "Heroes are exceptions". The prohibitions under discussion are at most only near-absolute. There are exceptions and loopholes. For the sake of the game it is probably best to assume that they won't come up in play, but in character generation all sorts of weirdness is possible.
-- -- "The T'ang emperors were strong believers in the pills of immortality. More emperors died of poisoning from ingesting minerals in the T'ang than in any other dynasty" - Eva Wong _The Shambhala Guide to Taoism_ Paul K.
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