ancestors and descendants

	#ancestors
	Class.ancestors
	=> [Class, Module, ActiveSupport::Dependencies::ModuleConstMissing, Object, Netfira::WebConnect, ActiveSupport::Dependencies::Loadable, JSON::Ext::Generator::GeneratorMethods::Object, Kernel, BasicObject]
	#descendants
	ObjectSpace.each_object(Class) do |klass|
	p klass if klass < StandardError
	end
	String.subclasses
	#=> [SQLite3::Blob, ActiveSupport::JSON::Encoding::JSONGemEncoder::EscapedString, Arel::Nodes::SqlLiteral]

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