PP::PPMethods#pp

# File tmp/rubies/ruby-3.1.3/lib/pp.rb, line 185
def pp(obj)
  # If obj is a Delegator then use the object being delegated to for cycle
  # detection
  obj = obj.__getobj__ if defined?(::Delegator) and obj.is_a?(::Delegator)

  if check_inspect_key(obj)
    group {obj.pretty_print_cycle self}
    return
  end

  begin
    push_inspect_key(obj)
    group {obj.pretty_print self}
  ensure
    pop_inspect_key(obj) unless PP.sharing_detection
  end
end