added note from http://isocpp.org/blog/2015/01/json-for-modern-cpp

test/json_unit.cc

@@ -1775,6 +1775,10 @@ TEST_CASE("Parser")
 
         auto j3 = "{\"key\": \"value\"}"_json;
         CHECK(j3["key"] == "value");
+
+        auto j22 = R"({"pi": 3.141, "happy": true })"_json;
+        auto j23 = "{ \"pi\": 3.141, \"happy\": true }"_json;
+        CHECK(j22 == j23);
     }
 
     SECTION("Errors")