Coerce debug config to boolean

I toggled "true" to "false" and it kept debugging. I should've just
removed the line, I guess, but I didn't want to.

Author: maxjacobson

lib/cc/engine/analyzers/engine_config.rb

@@ -10,7 +10,7 @@ def initialize(hash)
         end
 
         def debug?
-          config.fetch("config", {}).fetch("debug", false)
+          config.fetch("config", {}).fetch("debug", "false").to_s.casecmp("true").zero?
         end
 
         def include_paths

spec/cc/engine/analyzers/engine_config_spec.rb

@@ -170,4 +170,36 @@
       expect(engine_config.concurrency).to eq(45)
     end
   end
+
+  describe "debug" do
+    it "passes through booleans" do
+      engine_config = CC::Engine::Analyzers::EngineConfig.new({
+        "config" => {
+          "debug" => true,
+        },
+      })
+
+      expect(engine_config.debug?).to eq(true)
+    end
+
+    it "coerces 'true' to true" do
+      engine_config = CC::Engine::Analyzers::EngineConfig.new({
+        "config" => {
+          "debug" => "true",
+        },
+      })
+
+      expect(engine_config.debug?).to eq(true)
+    end
+
+    it "coerces 'false' to false" do
+      engine_config = CC::Engine::Analyzers::EngineConfig.new({
+        "config" => {
+          "debug" => "false",
+        },
+      })
+
+      expect(engine_config.debug?).to eq(false)
+    end
+  end
 end