Array
Binding
Class
Comparable
Dir
Enumerable
Enumerable::Enumerator
Enumerator
Exception
FalseClass
File
FileTest
Float
Functor
Hash
Indexable
InstanceVariables
Integer
Kernel
Lazy
Lazy::Future
Lazy::Promise
Lazy::PromiseSafe
MatchData
Module
NilClass
Numeric
Object
ObjectSpace
Proc
Range
Regexp
Stackable
String
Struct
Symbol
Time
TrueClass
UnboundMethod