Adds NilClass#null? #=> true and Object#null? #=> false

Useful for implementing custom null objects that will also return true for #null?

Add to your Gemfile:

gem 'null_question'

class NullObject
  def null?
    true
  end
end

nil.null? #=> true
NullObject.new.null? #=> true
Object.new.null? #=> false

Copyright (C) 2015 Jan Lelis https://janlelis.com. Released under the MIT license.