…d 'false' as argument values
It's hard to troubleshoot unexpected errors when the backtrace is silenced, as it was previously. Closes #59.
…pec::Core * It is possible for RSpec::Core to be defined, but not be fully loaded enough for RSpec.configuration to be accessible because rspec-core.gemspec requires 'lib/rspec/core/version' which defines RSpec::Core::Version but nothing else.
We've been getting a strange failure on rbx-19 that I can't reproduce locally: https://travis-ci.org/#!/rspec/rspec-expectations/jobs/2583529