Fix bug with parameterized return types of List

Author: KotlinFactory

pom.xml

@@ -3,7 +3,7 @@
   xmlns="http://maven.apache.org/POM/4.0.0"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <artifactId>simplixstorage</artifactId>
-  <version>3.2.6</version>
+  <version>3.2.7</version>
 
   <build>
     <defaultGoal>clean verify -U</defaultGoal>

src/main/java/de/leonhard/storage/internal/DataStorage.java

@@ -4,11 +4,12 @@
 import de.leonhard.storage.internal.serialize.SimplixSerializer;
 import de.leonhard.storage.util.ClassWrapper;
 import de.leonhard.storage.util.Valid;
-import java.util.*;
-import java.util.stream.Collectors;
 import lombok.NonNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.*;
+import java.util.stream.Collectors;
+
 public interface DataStorage {
 
   /**
@@ -199,15 +200,15 @@ default List<String> getStringList(final String key) {
   }
 
   default List<Integer> getIntegerList(final String key) {
-    return getOrDefault(key, new ArrayList<>());
+    return getOrDefault(key, new ArrayList<String>()).stream().map(Integer::parseInt).collect(Collectors.toList());
   }
 
   default List<Byte> getByteList(final String key) {
-    return getOrDefault(key, new ArrayList<>());
+    return getOrDefault(key, new ArrayList<String>()).stream().map(Byte::parseByte).collect(Collectors.toList());
   }
 
   default List<Long> getLongList(final String key) {
-    return getOrDefault(key, new ArrayList<>());
+    return getOrDefault(key, new ArrayList<String>()).stream().map(Long::parseLong).collect(Collectors.toList());
   }
 
   default Map<?, ?> getMap(final String key) {