class Rational: b (b>0), where a is the numerator and b is the denominator. mathematically.| docs.ruby-lang.org
class Numeric: Numeric is the class from which all higher-level numeric classes should inherit. Numeric allows instantiation of heap-allocated objects.| docs.ruby-lang.org
class Complex: i>. en.| docs.ruby-lang.org
module Kernel: The Kernel module is included by class Object, so its methods are available in every Ruby object. The Kernel instance methods are documented in class| docs.ruby-lang.org
ractor: Ractor - Ruby's Actor-like concurrent abstraction Ractor is designed to provide a parallel execution feature of Ruby without thread-safety concerns.| docs.ruby-lang.org