Great thoughts! > I'd like a way to make them all noops Sure! There's a default failure callback that gets called when a contract fails. You can just clear th

Great thoughts! > I'd like a way to make them all noops Sure! There's a default failure callback that gets called when a contract fails. You can just clear this callback in prod: if ENV == PRODUCTION class Contract def self.failure_callback(data) # blank end end end > I'm disappointed that your system seems to offer little more than type checking Nay! You can write your own contracts to do anything you want. So yes, lambdas are allowed in contracts: Contract lambda { |x| x.is_valid_email? } => Bool def save_email(email) # save an email end > with common idioms abbreviated I provide some common idioms already, but you can make your own abbreviations: ValidEmail = lambda { |x| x.is_valid_email? } Contract ValidEmail => Bool def save_email(email) Let me know if you have any other questions :)