Use MutableArrayList as default stack impl

build.gradle.kts

@@ -31,7 +31,7 @@ allprojects {
 
     dependencies {
         compileOnlyApi("org.jetbrains:annotations:24.0.1")
-        testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
+        testImplementation("org.junit.jupiter:junit-jupiter:5.10.0")
     }
 
     var multiRelease = false;

kala-collection/src/main/java/kala/collection/mutable/MutableArrayList.java

@@ -25,7 +25,7 @@
 import java.util.stream.Stream;
 
 @SuppressWarnings("unchecked")
-public final class MutableArrayList<E> extends AbstractMutableList<E> implements IndexedSeq<E>, Serializable {
+public final class MutableArrayList<E> extends AbstractMutableList<E> implements MutableStack<E>, IndexedSeq<E>, Serializable {
     private static final long serialVersionUID = 2545219250020890853L;
 
     private static final MutableArrayList.Factory<?> FACTORY = new Factory<>();
@@ -652,6 +652,25 @@ public int copyToArray(int srcPos, Object @NotNull [] dest, int destPos, int lim
         return size == 0 ? ImmutableArray.empty() : (ImmutableArray<E>) ImmutableArray.Unsafe.wrap(Arrays.copyOf(elements, size));
     }
 
+    //region Stack
+
+    @Override
+    public void push(E value) {
+        this.append(value);
+    }
+
+    @Override
+    public E pop() {
+        return removeLast();
+    }
+
+    @Override
+    public E peek() {
+        return getLast();
+    }
+
+    //endregion
+
     //region Serialization
 
     private void writeObject(ObjectOutputStream out) throws IOException {

kala-collection/src/main/java/kala/collection/mutable/MutableStack.java

@@ -9,16 +9,16 @@ public interface MutableStack<E> extends MutableCollection<E> {
 
     @Contract("-> new")
     static <E> @NotNull MutableStack<E> create() {
-        return new MutableSinglyLinkedList<>();
+        return MutableArrayList.create();
     }
 
+    // boolean isEmpty();
+
     @Contract(mutates = "this")
     void push(E value);
 
     @Contract(mutates = "this")
     E pop();
 
     E peek();
-
-    boolean isEmpty();
 }