From 7d55d6db8782394cea421ba723544f314a2b95c6 Mon Sep 17 00:00:00 2001
From: LeoDog896 <LeoDog896@hotmail.com>
Date: Tue, 20 Jul 2021 13:58:40 -0400
Subject: [PATCH 1/3] Add #equals method

---
 .../net/minestom/server/item/rule/VanillaStackingRule.java | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/main/java/net/minestom/server/item/rule/VanillaStackingRule.java b/src/main/java/net/minestom/server/item/rule/VanillaStackingRule.java
index 9e6b41272..cd1cadc5c 100644
--- a/src/main/java/net/minestom/server/item/rule/VanillaStackingRule.java
+++ b/src/main/java/net/minestom/server/item/rule/VanillaStackingRule.java
@@ -33,4 +33,11 @@ public class VanillaStackingRule implements StackingRule {
     public int getMaxSize(@NotNull ItemStack itemStack) {
         return itemStack.getMaterial().getMaxDefaultStackSize();
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+
+        return obj != null && getClass() == obj.getClass();
+    }
 }

From 8e849ad947a1b7c9bb0fbd0f0e39f863c4f8710c Mon Sep 17 00:00:00 2001
From: LeoDog896 <LeoDog896@hotmail.com>
Date: Tue, 20 Jul 2021 14:03:55 -0400
Subject: [PATCH 2/3] Add constant in ItemStack for VanillaStackingRule

---
 src/main/java/net/minestom/server/item/ItemStack.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/net/minestom/server/item/ItemStack.java b/src/main/java/net/minestom/server/item/ItemStack.java
index a67d350f3..707144f84 100644
--- a/src/main/java/net/minestom/server/item/ItemStack.java
+++ b/src/main/java/net/minestom/server/item/ItemStack.java
@@ -31,6 +31,8 @@ public final class ItemStack implements TagReadable, HoverEventSource<HoverEvent
      */
     public static final @NotNull ItemStack AIR = ItemStack.of(Material.AIR);
 
+    public static final @NotNull VanillaStackingRule DEFAULT_STACKING_RULE = new VanillaStackingRule();
+
     private final StackingRule stackingRule;
 
     private final Material material;
@@ -43,7 +45,7 @@ public final class ItemStack implements TagReadable, HoverEventSource<HoverEvent
         this.material = material;
         this.amount = amount;
         this.meta = meta;
-        this.stackingRule = Objects.requireNonNullElseGet(stackingRule, VanillaStackingRule::new);
+        this.stackingRule = Objects.requireNonNullElse(stackingRule, DEFAULT_STACKING_RULE);
     }
 
     @Contract(value = "_ -> new", pure = true)

From 8a7d13c8ada16b6c914b35e316af16c26bd8e36d Mon Sep 17 00:00:00 2001
From: LeoDog896 <LeoDog896@hotmail.com>
Date: Tue, 20 Jul 2021 14:07:16 -0400
Subject: [PATCH 3/3] Make the constant static?

---
 src/main/java/net/minestom/server/item/ItemStack.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/net/minestom/server/item/ItemStack.java b/src/main/java/net/minestom/server/item/ItemStack.java
index 707144f84..4e93bc0c2 100644
--- a/src/main/java/net/minestom/server/item/ItemStack.java
+++ b/src/main/java/net/minestom/server/item/ItemStack.java
@@ -31,7 +31,7 @@ public final class ItemStack implements TagReadable, HoverEventSource<HoverEvent
      */
     public static final @NotNull ItemStack AIR = ItemStack.of(Material.AIR);
 
-    public static final @NotNull VanillaStackingRule DEFAULT_STACKING_RULE = new VanillaStackingRule();
+    private static final @NotNull VanillaStackingRule DEFAULT_STACKING_RULE = new VanillaStackingRule();
 
     private final StackingRule stackingRule;