#
# Pervasives allows an object's methods to be accessed in a pristine state,
# even when some effort has been made to derride them
#
  require 'pervasives'

  class BlankSlate
    instance_methods.each{|m| undef_method m unless m[%r/__/]}
  end

  bs = BlankSlate.new

  p Pervasives(bs).methods #=> ["__object_pervasive__", "__id__", "__send__", "__pervasive__"]

  p Pervasives(bs).is_a?(BlankSlate) #=> true

  p Pervasives(bs).instance_eval{ @a = 42 } #=> 42

  p Pervasives(bs).instance_variables #=> ["@a"]