module T::Props::WeakConstructor

def initialize(hash={})
  decorator = self.class.decorator
  hash_keys_matching_props = decorator.construct_props_with_defaults(self, hash) +
    decorator.construct_props_without_defaults(self, hash)
  if hash_keys_matching_props < hash.size
    raise ArgumentError.new("#{self.class}: Unrecognized properties: #{(hash.keys - decorator.props.keys).join(', ')}")
  end
end