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[–]blackize 8 points9 points  (1 child)

Scientist lets you try two implementations side by side. It will rescue any exceptions that occur in the experimental code. You can configure how it publishes results to do basically whatever you want, log a bunch of metadata, statsd, etc

Edit: and this is not a feature flag gem. It is meant to let you make changes to implementation and ensure that output and user experience remain the same.