Changed integer storage from positive/negative to signed/unsigned

extras/tests/MsgPackSerializer/serializeVariant.cpp

@@ -46,8 +46,14 @@ TEST_CASE("serialize MsgPack value") {
   }
 
   SECTION("positive fixint") {
-    checkVariant(0, "\x00");
-    checkVariant(127, "\x7F");
+    SECTION("signed") {
+      checkVariant(0, "\x00");
+      checkVariant(127, "\x7F");
+    }
+    SECTION("unsigned") {
+      checkVariant(0U, "\x00");
+      checkVariant(127U, "\x7F");
+    }
   }
 
   SECTION("uint 8") {