Disable warning:

warning C4800: forcing value to bool 'true' or 'false' (performance warning)

for the node test, since it really doesn't make any sense in this context. (It's exactly what we intended with the "unspecified bool type".)

test/node/node_test.cpp

@@ -232,6 +232,7 @@ TEST(NodeTest, Bool) {
 }
 
 TEST(NodeTest, AutoBoolConversion) {
+#pragma warning(disable:4800)
   YAML::Node node;
   node["foo"] = "bar";
   EXPECT_TRUE(static_cast<bool>(node["foo"]));