module Plumb
module Plumb::Attributes
module Plumb::Attributes::ClassMethods
module Plumb::Callable
module Plumb::Composable
module Plumb::Equality
module Plumb::Naming
module Plumb::SplitPolicy
module Plumb::TypeRegistry
module Plumb::Types
module Plumb::Types::Forms
module Plumb::Types::Forms::URI
module Plumb::Types::Lax
module Plumb::Types::URI
module Plumb::Types::UUID
module Plumb::VisitorHandlers
module Plumb::VisitorHandlers::ClassMethods
class Plumb::And
class Plumb::AnyClass
class Plumb::ArrayClass
class Plumb::ArrayClass::ConcurrentArrayClass
class Plumb::AttributeValueMatch
class Plumb::Build
class Plumb::Composable::Node
class Plumb::Decorator
class Plumb::Deferred
class Plumb::HashClass
class Plumb::HashMap
class Plumb::HashMap::FilteredHashMap
class Plumb::InterfaceClass
class Plumb::JSONSchemaVisitor
class Plumb::Key
class Plumb::MatchClass
class Plumb::Metadata
class Plumb::MetadataVisitor
class Plumb::Naming::Name
class Plumb::Not
class Plumb::Or
class Plumb::Pipeline
class Plumb::Pipeline::AroundStep
class Plumb::Policies
class Plumb::Policy
class Plumb::Result
class Plumb::Result::Invalid
class Plumb::Result::Valid
class Plumb::Schema
class Plumb::Schema::Field
class Plumb::Schema::SymbolAccessHash
class Plumb::StaticClass
class Plumb::Step
class Plumb::StreamClass
class Plumb::TaggedHash
class Plumb::Transform
class Plumb::TupleClass
class Plumb::Types::Data
class Plumb::UndefinedClass
class Plumb::ValueClass
plumb
0.0.12
# optional?
def optional? @optional end