Rational Ruby on Rails 5.1.2 Class Rational < Object activesupport/lib/active_support/core_ext/object/duplicable.rb Methods D duplicable? Instance Public methods duplicable?() Link Rationals are not duplicable for RUBY_VERSION < 2.5.0: Rational(1).duplicable? # => false Rational(1).dup # => TypeError: can't copy Rational Source: show | on GitHub # File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 150 def duplicable? false end