debug expansion fails at times

[rdp]

ex: expanding @@active_connections within a rails process.

NoMethodError: undefined method `<=>' for :database:Symbol
---< backtrace of Ruby side >-----
./ext/ae-ruby-debug/ae-ruby-debug.rb:602:in `sort'
./ext/ae-ruby-debug/ae-ruby-debug.rb:602:in `var_deep'
./ext/ae-ruby-debug/ae-ruby-debug.rb:630:in `var_deep'
./ext/ae-ruby-debug/ae-ruby-debug.rb:604:in `each'
./ext/ae-ruby-debug/ae-ruby-debug.rb:604:in `var_deep'
./ext/ae-ruby-debug/ae-ruby-debug.rb:630:in `var_deep'
./ext/ae-ruby-debug/ae-ruby-debug.rb:604:in `each'
./ext/ae-ruby-debug/ae-ruby-debug.rb:604:in `var_deep'
./ext/ae-ruby-debug/ae-ruby-debug.rb:584:in `inspect_node'
./ext/ae-ruby-debug/ae-ruby-debug.rb:195:in `build_var_panel'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1187:in `call'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1187:in `eval_cmd'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1187:in `cb_eval'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1138:in `call'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1324:in `callback'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1323:in `catch'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1323:in `callback'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1557:in `mainloop'
C:/ruby18/lib/ruby/site_ruby/1.8/tk.rb:1557:in `mainloop'
./lib/a-tkcommons.rb:62:in `run'
C:/ruby18/lib/ruby/gems/1.8/gems/arcadia-0.7.0.1/bin/arcadia:12
c:/ruby18/bin/arcadia:19:in `load'
c:/ruby18/bin/arcadia:19
---< backtrace of Tk side >-------
    invoked from within
"rb_out c00390 class_var@@@@@active_connections"
    ("uplevel" body line 1)
    invoked from within
"uplevel \#0 $cmd [list $node]"
    (procedure "Tree::_cross_event" line 14)
    invoked from within
"Tree::_cross_event .w00001.frame.w00250.w00253.w00255.fvars.w00256"
    (command bound to event)