Complex Ruby on Rails 5.1.2 Class Complex < Object activesupport/lib/active_support/core_ext/numeric/inquiry.rb activesupport/lib/active_support/core_ext/object/duplicable.rb Methods D duplicable? Instance Public methods duplicable?() Link Complexes are not duplicable for RUBY_VERSION < 2.5.0: Complex(1).duplicable? # => false Complex(1).dup # => TypeError: can't copy Complex Source: show | on GitHub # File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 135 def duplicable? false end