class Object
# Can you safely .dup this object?
# False for nil, false, true, symbols, and numbers; true otherwise.
def duplicable?
true
end
class NilClass #:nodoc:
false
class FalseClass #:nodoc:
class TrueClass #:nodoc:
class Symbol #:nodoc:
class Numeric #:nodoc:
class Class #:nodoc: