* Decide a way to test methods that are only visible given a specific command-line option. For example, Kernel#gsub with -n/-p on 1.9. * Look at automating discovery of guarded bugs which have been fixed. * Use mocks for all Math functions that coerce with #to_f; currently a fixture is used. * investigate slow specs (run with -fp) and make them faster. * restore some caller specs from 642bf529 * restore refinements specs and update. See 56c5528f and f20a62e8.