ruby `ObjectSpace` usage from debugging a memory leak in inbox-sync

so_i_dont_forget.rb

# used to make sure old mail items were getting garbage collected

# in the runner loop...
puts "InboxSync objects in memory:
ObjectSpace.each_object(Object) do |x|
  if x.class.name.include?('InboxSync')
    puts "#<#{x.class}:#{'0x%x' % (x.object_id << 1)}"
  end
end

# in the sync handler invoked by the runner loop...
items = MailItem.find(@source_imap)
puts "mail items in memory:"
mail_item_count = ObjectSpace.each_object(InboxSync::MailItem) do |x|
  if x.class.name.include?('InboxSync')
    puts x.inspect
  end
end
puts "mail item count: #{mail_item_count}"