chore: Add missing @Nullable

core/src/main/java/cc/carm/lib/configuration/builder/impl/AbstractSectionBuilder.java

@@ -49,9 +49,7 @@ public abstract class AbstractSectionBuilder<
     }
 
     public @NotNull SELF serialize(@NotNull DataFunction<PARAM, ? extends Map<String, Object>> serializer) {
-        return serialize((p, value) -> {
-            return serializer.handle(value);
-        });
+        return serialize((p, value) -> serializer.handle(value));
     }
 
     public @NotNull SELF serialize(@NotNull ValueConsumer<Map<String, Object>, PARAM> serializer) {

core/src/main/java/cc/carm/lib/configuration/value/ValueManifest.java

@@ -110,7 +110,7 @@ public class ValueManifest<T> {
     }
 
     @ApiStatus.Internal
-    protected Object getData() {
+    protected @Nullable Object getData() {
         return config().get(path());
     }