1.8 passes, 1.9 however...

  1) Failure:
test_thread_timings(ThreadTest) [E:/dev/ruby/ruby-prof/test/thread_test.rb:76]:
Expected 0 - 1.0 (1.0) to be < 0.01.

43 tests, 410 assertions, 1 failures, 0 errors, 0 skips
rake aborted!