This feels like a bizarre straw man. Yes, you can use lead paint on road markings because no one will lick them and lead paint is amazingly resilient to water d

This feels like a bizarre straw man. Yes, you can use lead paint on road markings because no one will lick them and lead paint is amazingly resilient to water damage -- but I think we all have a shared understanding in a casual conversation about what we mean when we say "lead paint is banned", there's no need for someone to say "well actually -- that's not strictly true, current regulations still allow for non-consumer use and old buildings are still grandfathered in if they have not been repainted, and additionally its not an outright ban but like most substances it means it has to fall under a certain percent content". Either way, these are still ultimately binary restrictions in their respective domains. It's a cascade of if statements, not a smooth function. Just because there are twenty binary decisions, or the decisions are in separate categories, does not make them non-binary. A non-binary approach would be something like having a gradient of punishments for a smooth spectrum of allowed percentages. It's hard to properly describe, because again, it's not really often seen.