Bugfix update + Upstream (Pufferfish)

Closes #11

patches/server/0065-lithium-cached-hashcode.patch

@@ -0,0 +1,44 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: jellysquid3 <jellysquid3@users.noreply.github.com>
+Date: Wed, 15 Dec 2021 11:30:23 -0500
+Subject: [PATCH] lithium: cached hashcode
+
+Original code by CaffeineMC, licensed under GNU Lesser General Public License v3.0
+You can find the original code on https://github.com/CaffeineMC/lithium-fabric (Yarn mappings)
+
+diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
+index ab5b9f00123e2ede2931ffc520684e482aac49b4..230848eb7e78fb67d5a679f402e3057f0064f1eb 100644
+--- a/src/main/java/net/minecraft/world/level/block/Block.java
++++ b/src/main/java/net/minecraft/world/level/block/Block.java
+@@ -589,11 +589,18 @@ public class Block extends BlockBehaviour implements ItemLike {
+         private final BlockState first;
+         private final BlockState second;
+         private final Direction direction;
++        private int hash; // JettPack
+ 
+         public BlockStatePairKey(BlockState self, BlockState other, Direction facing) {
+             this.first = self;
+             this.second = other;
+             this.direction = facing;
++            // JettPack start - lithium: cached_hashcode
++            int hash = this.first.hashCode();
++            hash = 31 * hash + this.second.hashCode();
++            hash = 31 * hash + this.direction.hashCode();
++            this.hash = hash;
++            // JettPack end
+         }
+ 
+         public boolean equals(Object object) {
+@@ -609,11 +616,7 @@ public class Block extends BlockBehaviour implements ItemLike {
+         }
+ 
+         public int hashCode() {
+-            int i = this.first.hashCode();
+-
+-            i = 31 * i + this.second.hashCode();
+-            i = 31 * i + this.direction.hashCode();
+-            return i;
++            return this.hash; // JettPack
+         }
+     }
+ }