Test Suite fails in Ruby 2

[bryanwoods]

$ ruby -v
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin11.4.2]

$ rake spec

Failures:

1. TimedRedSet.since returns an array of elements with timestamps if the with_scores option is true
   Failure/Error: {20 => Time.at(2.5), 30 => Time.at(3.5)}
   NoMethodError:
   undefined method `encoding' for 20:Fixnum

   ./spec/redness/timed_red_set_spec.rb:64:in`block (3 levels) in <top (required)>'

2. TimedRedSet.since supports using the :upper/:lower and :with_scores attributes together
   Failure/Error: {20 => Time.at(2.5)}
   NoMethodError:
   undefined method `encoding' for 20:Fixnum

   ./spec/redness/timed_red_set_spec.rb:73:in`block (3 levels) in <top (required)>'

Finished in 1.16 seconds
77 examples, 2 failures