nil is true in ?:

nil_true.rb

class Proxy
  instance_methods.each do |method|
    undef_method(method) unless method =~ /(^__|^send$|^object_id$|^extend$)/
  end
  
  def initialize(target)
    @target = target
  end
  
  def method_missing(name, *args, &block)
    @target.send(name, *args, &block)
  end
end

n = Proxy.new(nil)
p nil ? 1 : 2 # 2
p n ? 1 : 2 # 1