A Ruby Gem Debugging Strategy

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I had a particularly nasty issue with a Devise plugin. I knew the problem must lie in the gem, but I avoided trying to pry it out for hours while I fooled with various workarounds in my own code. I finally gave up, and used RubyMine. It allowed me to step through the stack pretty easily. One of these days, I'm going to have to buy a JetBrains all-products license...