Methods
D
Instance Public methods
duplicable?()

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