ActiveSupport::JSON.decode breaking when updating to Rails 2.3.16

gistfile1.rb

@object = "{'source': 'Direct', 'details': 'Unknown', 'vdate': 1333236870729}"

Rails 3.2.15

>    ActiveSupport::JSON.decode(@object)
# => {"details"=>"Unknown", "vdate"=>1333236870729, "source"=>"Direct"}

Rails 3.2.16

>    ActiveSupport::JSON.decode(@object)
# => ActiveSupport::OkJson::Error: invalid character at "'source': 'D"

stacktrace

from /Users/schopenhauer/.rvm/gems/ruby-1.8.7-p370@contiki/gems/activesupport-2.3.16/lib/active_support/json/backends/okjson.rb:180:in `lex'
from /Users/schopenhauer/.rvm/gems/ruby-1.8.7-p370@contiki/gems/activesupport-2.3.16/lib/active_support/json/backends/okjson.rb:46:in `decode'
from /Users/schopenhauer/.rvm/gems/ruby-1.8.7-p370@contiki/gems/activesupport-2.3.16/lib/active_support/json/backends/okjson.rb:612:in `decode'
from /Users/schopenhauer/.rvm/gems/ruby-1.8.7-p370@contiki/gems/activesupport-2.3.16/lib/active_support/json/decoding.rb:14:in `__send__'
from /Users/schopenhauer/.rvm/gems/ruby-1.8.7-p370@contiki/gems/activesupport-2.3.16/lib/active_support/json/decoding.rb:14:in `decode'

[7] pry(main)> @object = "{"source": "Direct", "details": "Unknown", "vdate": 1333236870729}"
=> "{"source": "Direct", "details": "Unknown", "vdate": 1333236870729}"

[8] pry(main)> ActiveSupport::JSON.decode(@object)
=> {"source"=>"Direct", "details"=>"Unknown", "vdate"=>1333236870729}

This happens in rails 3.0.20 as well. Apparently single-quotes no longer work, it will only accept double-quotes. Replacing single-quotes with double-quotes is not a viable solution; this was a minor release and should not introduce backwards incompatibilities.