Cleanup and sync placed spell owners

src/main/java/com/minelittlepony/unicopia/Race.java

@@ -10,8 +10,8 @@ import com.google.common.base.Strings;
 import com.minelittlepony.unicopia.ability.Abilities;
 import com.minelittlepony.unicopia.ability.Ability;
 import com.minelittlepony.unicopia.ability.magic.Affine;
+import com.minelittlepony.unicopia.network.track.TrackableDataType;
 import com.minelittlepony.unicopia.util.RegistryUtils;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.brigadier.exceptions.DynamicCommandExceptionType;
@@ -45,7 +45,7 @@ public record Race (
     public static final String DEFAULT_ID = "unicopia:unset";
     public static final Registry<Race> REGISTRY = RegistryUtils.createDefaulted(Unicopia.id("race"), DEFAULT_ID);
     public static final Registry<Race> COMMAND_REGISTRY = RegistryUtils.createDefaulted(Unicopia.id("race/grantable"), DEFAULT_ID);
-    public static final PacketCodec<Race> PACKET_CODEC = PacketCodec.ofRegistry(REGISTRY);
+    public static final TrackableDataType<Race> TRACKABLE_TYPE = TrackableDataType.RACE;
     public static final RegistryKey<? extends Registry<Race>> REGISTRY_KEY = REGISTRY.getKey();
     private static final DynamicCommandExceptionType UNKNOWN_RACE_EXCEPTION = new DynamicCommandExceptionType(id -> Text.translatable("commands.race.fail", id));
     private static final Function<Race, Composite> COMPOSITES = Util.memoize(race -> new Composite(race, null, null));

src/main/java/com/minelittlepony/unicopia/entity/Creature.java

@@ -23,7 +23,6 @@ import com.minelittlepony.unicopia.entity.ai.WantItTakeItGoal;
 import com.minelittlepony.unicopia.entity.mob.UEntityAttributes;
 import com.minelittlepony.unicopia.network.track.DataTracker;
 import com.minelittlepony.unicopia.network.track.TrackableDataType;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
 
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.LivingEntity;
@@ -62,7 +61,6 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
                 .isEmpty();
     });
 
-    protected final DataTracker.Entry<NbtCompound> master;
     protected final DataTracker.Entry<Integer> eating;
     protected final DataTracker.Entry<Boolean> discorded;
     protected final DataTracker.Entry<Boolean> smitten;
@@ -73,16 +71,15 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
         addTicker(physics);
         addTicker(this::updateConsumption);
 
-        master = tracker.startTracking(TrackableDataType.of(PacketCodec.NBT), owner.toNBT());
+        tracker.startTracking(owner);
-        eating = tracker.startTracking(TrackableDataType.of(PacketCodec.INT), 0);
+        eating = tracker.startTracking(TrackableDataType.INT, 0);
-        discorded = tracker.startTracking(TrackableDataType.of(PacketCodec.BOOLEAN), false);
+        discorded = tracker.startTracking(TrackableDataType.BOOLEAN, false);
-        smitten = tracker.startTracking(TrackableDataType.of(PacketCodec.BOOLEAN), false);
+        smitten = tracker.startTracking(TrackableDataType.BOOLEAN, false);
     }
 
     @Override
     public void setMaster(LivingEntity owner) {
         this.owner.set(owner);
-        tracker.set(master, this.owner.toNBT());
         if (owner != null) {
             targets.ifPresent(this::initMinionAi);
         }
@@ -93,20 +90,20 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
     }
 
     public boolean isDiscorded() {
-        return tracker.get(this.discorded);
+        return discorded.get();
     }
 
     public boolean isSmitten() {
-        return tracker.get(this.smitten);
+        return smitten.get();
     }
 
     public void setSmitten(boolean smitten) {
         smittenTicks = smitten ? 20 : 0;
-        tracker.set(this.smitten, smitten);
+        this.smitten.set(smitten);
     }
 
     public void setDiscorded(boolean discorded) {
-        tracker.set(this.discorded, discorded);
+        this.discorded.set(discorded);
         discordedChanged = true;
     }
 
@@ -118,9 +115,6 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
 
     @Override
     public EntityReference<LivingEntity> getMasterReference() {
-        if (master != null) {
-            owner.fromNBT(tracker.get(master));
-        }
         return owner;
     }
 
@@ -232,10 +226,10 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
 
     private void updateConsumption() {
         if (isClient()) {
-            eatTimer = tracker.get(eating);
+            eatTimer = eating.get();
         } else if (eatMuffinGoal != null) {
             eatTimer = eatMuffinGoal.getTimer();
-            tracker.set(eating, eatTimer);
+            eating.set(eatTimer);
         }
     }
 
@@ -324,9 +318,6 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
         }
         if (compound.contains("master", NbtElement.COMPOUND_TYPE)) {
             owner.fromNBT(compound.getCompound("master"));
-            if (master != null) {
-                tracker.set(master, owner.toNBT());
-            }
             if (owner.isSet()) {
                 targets.ifPresent(this::initMinionAi);
             }

src/main/java/com/minelittlepony/unicopia/entity/EntityPhysics.java

@@ -6,7 +6,6 @@ import com.minelittlepony.unicopia.network.track.Trackable;
 import com.minelittlepony.unicopia.network.track.TrackableDataType;
 import com.minelittlepony.unicopia.util.Copyable;
 import com.minelittlepony.unicopia.util.Tickable;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.block.FenceGateBlock;
@@ -31,7 +30,7 @@ public class EntityPhysics<T extends Entity> implements Physics, Copyable<Entity
     public EntityPhysics(T entity) {
         this.entity = entity;
         this.tracker = Trackable.of(entity).getDataTrackers().getPrimaryTracker();
-        gravity = tracker.startTracking(TrackableDataType.of(PacketCodec.FLOAT), 1F);
+        gravity = tracker.startTracking(TrackableDataType.FLOAT, 1F);
     }
 
     @Override
@@ -96,12 +95,12 @@ public class EntityPhysics<T extends Entity> implements Physics, Copyable<Entity
 
     @Override
     public void setBaseGravityModifier(float constant) {
-        tracker.set(gravity, constant);
+        gravity.set(constant);
     }
 
     @Override
     public float getBaseGravityModifier() {
-        return tracker.get(gravity);
+        return gravity.get();
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java

@@ -10,6 +10,7 @@ import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.Levelled;
+import com.minelittlepony.unicopia.network.track.TrackableObject;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.player.PlayerEntity;
@@ -29,7 +30,7 @@ import net.minecraft.world.World;
  *
  * @param <T> The type of the entity this reference points to.
  */
-public class EntityReference<T extends Entity> implements NbtSerialisable {
+public class EntityReference<T extends Entity> implements NbtSerialisable, TrackableObject {
     private static final Serializer<?> SERIALIZER = Serializer.of(EntityReference::new);
 
     @SuppressWarnings("unchecked")
@@ -42,6 +43,8 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
 
     private WeakReference<T> directReference = new WeakReference<>(null);
 
+    private boolean dirty = true;
+
     public EntityReference() {}
 
     public EntityReference(T entity) {
@@ -61,13 +64,14 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
     public boolean set(@Nullable T entity) {
         this.directReference = new WeakReference<>(entity);
         this.reference = entity == null ? null : new EntityValues<>(entity);
+        this.dirty = true;
         return entity != null;
     }
 
     public Optional<EntityValues<T>> getTarget() {
         T value = directReference.get();
         if (value != null) {
-            set(value);
+            this.reference = new EntityValues<>(value);
         }
         return Optional.ofNullable(reference);
     }
@@ -113,11 +117,41 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
     @Override
     public void fromNBT(NbtCompound tag) {
         this.reference = tag.contains("uuid") ? new EntityValues<>(tag) : null;
+        this.dirty = true;
     }
 
     @Override
     public int hashCode() {
-        return getTarget().map(EntityValues::uuid).orElse(Util.NIL_UUID).hashCode();
+        return getUuid().hashCode();
+    }
+
+    @Override
+    public UUID getUuid() {
+        return getTarget().map(EntityValues::uuid).orElse(Util.NIL_UUID);
+    }
+
+    @Override
+    public Status getStatus() {
+        if (dirty) {
+            dirty = false;
+            return Status.UPDATED;
+        }
+        return Status.DEFAULT;
+    }
+
+    @Override
+    public NbtCompound toTrackedNbt() {
+        return toNBT();
+    }
+
+    @Override
+    public void readTrackedNbt(NbtCompound compound) {
+        fromNBT(compound);
+    }
+
+    @Override
+    public void discard(boolean immediate) {
+        set(null);
     }
 
     public record EntityValues<T extends Entity>(

src/main/java/com/minelittlepony/unicopia/entity/ItemImpl.java

@@ -8,7 +8,6 @@ import com.minelittlepony.unicopia.item.enchantment.WantItNeedItEnchantment;
 import com.minelittlepony.unicopia.network.track.DataTracker;
 import com.minelittlepony.unicopia.network.track.DataTrackerManager;
 import com.minelittlepony.unicopia.network.track.Trackable;
-import com.minelittlepony.unicopia.network.track.TrackableDataType;
 import com.minelittlepony.unicopia.particle.FollowingParticleEffect;
 import com.minelittlepony.unicopia.particle.ParticleUtils;
 import com.minelittlepony.unicopia.particle.UParticles;
@@ -44,7 +43,7 @@ public class ItemImpl implements Equine<ItemEntity> {
         this.tracker = trackers.getPrimaryTracker();
         this.physics = new ItemPhysics(owner);
 
-        race = tracker.startTracking(TrackableDataType.of(Race.PACKET_CODEC), Race.HUMAN);
+        race = tracker.startTracking(Race.TRACKABLE_TYPE, Race.HUMAN);
     }
 
     @Override
@@ -141,12 +140,12 @@ public class ItemImpl implements Equine<ItemEntity> {
 
     @Override
     public Race getSpecies() {
-        return tracker.get(race);
+        return race.get();
     }
 
     @Override
     public void setSpecies(Race race) {
-        tracker.set(this.race, race);
+        this.race.set(race);
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/entity/Living.java

@@ -40,7 +40,6 @@ import com.minelittlepony.unicopia.particle.ParticleUtils;
 import com.minelittlepony.unicopia.projectile.ProjectileImpactListener;
 import com.minelittlepony.unicopia.server.world.DragonBreathStore;
 import com.minelittlepony.unicopia.util.*;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
 
 import it.unimi.dsi.fastutil.floats.Float2ObjectFunction;
 import net.fabricmc.fabric.api.util.TriState;
@@ -116,7 +115,7 @@ public abstract class Living<T extends LivingEntity> implements Equine<T>, Caste
         this.landedHeuristic = addTicker(new Interactable(entity::isOnGround));
         this.jumpingHeuristic = addTicker(new Interactable(((LivingEntityDuck)entity)::isJumping));
 
-        carrierId = tracker.startTracking(TrackableDataType.of(PacketCodec.UUID), Util.NIL_UUID);
+        carrierId = tracker.startTracking(TrackableDataType.UUID, Util.NIL_UUID);
     }
 
     public <Q extends Tickable> Q addTicker(Q tickable) {
@@ -171,12 +170,12 @@ public abstract class Living<T extends LivingEntity> implements Equine<T>, Caste
     }
 
     public Optional<UUID> getCarrierId() {
-        UUID carrierId = tracker.get(this.carrierId);
+        UUID carrierId = this.carrierId.get();
         return carrierId == Util.NIL_UUID ? Optional.empty() : Optional.of(carrierId);
     }
 
     public void setCarrier(UUID carrier) {
-        tracker.set(this.carrierId, carrier == null ? Util.NIL_UUID : carrier);
+        carrierId.set(carrier == null ? Util.NIL_UUID : carrier);
     }
 
     public void setCarrier(Entity carrier) {

src/main/java/com/minelittlepony/unicopia/entity/mob/CastSpellEntity.java

@@ -12,6 +12,8 @@ import com.minelittlepony.unicopia.entity.EntityPhysics;
 import com.minelittlepony.unicopia.entity.EntityReference;
 import com.minelittlepony.unicopia.entity.MagicImmune;
 import com.minelittlepony.unicopia.entity.Physics;
+import com.minelittlepony.unicopia.network.track.Trackable;
+
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityDimensions;
 import net.minecraft.entity.EntityPose;
@@ -50,6 +52,7 @@ public class CastSpellEntity extends LightEmittingEntity implements Caster<CastS
     public CastSpellEntity(EntityType<?> type, World world) {
         super(type, world);
         ignoreCameraFrustum = true;
+        Trackable.of(this).getDataTrackers().getPrimaryTracker().startTracking(owner);
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/entity/player/Acrobatics.java

@@ -12,8 +12,6 @@ import com.minelittlepony.unicopia.network.track.DataTracker;
 import com.minelittlepony.unicopia.network.track.TrackableDataType;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
 import com.minelittlepony.unicopia.util.Tickable;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
-
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
 import net.minecraft.block.SideShapeType;
@@ -36,14 +34,12 @@ public class Acrobatics implements Tickable, NbtSerialisable {
     private final Pony pony;
     private final PlayerEntity entity;
 
-    private final DataTracker tracker;
     private final DataTracker.Entry<Optional<BlockPos>> hangingPos;
 
     public Acrobatics(Pony pony, DataTracker tracker) {
         this.pony = pony;
-        this.tracker = tracker;
         this.entity = pony.asEntity();
-        this.hangingPos = tracker.startTracking(TrackableDataType.of(PacketCodec.OPTIONAL_POS), Optional.empty());
+        this.hangingPos = tracker.startTracking(TrackableDataType.OPTIONAL_POS, Optional.empty());
         pony.addTicker(this::checkDislodge);
     }
 
@@ -146,7 +142,7 @@ public class Acrobatics implements Tickable, NbtSerialisable {
     }
 
     public Optional<BlockPos> getHangingPosition() {
-        return tracker.get(hangingPos);
+        return hangingPos.get();
     }
 
     public boolean isHanging() {
@@ -154,13 +150,13 @@ public class Acrobatics implements Tickable, NbtSerialisable {
     }
 
     public void stopHanging() {
-        tracker.set(hangingPos, Optional.empty());
+        hangingPos.set(Optional.empty());
         entity.calculateDimensions();
         ticksHanging = 0;
     }
 
     public void startHanging(BlockPos pos) {
-        tracker.set(hangingPos, Optional.of(pos));
+        hangingPos.set(Optional.of(pos));
         entity.teleport(pos.getX() + 0.5, pos.getY() - 1, pos.getZ() + 0.5);
         entity.setVelocity(Vec3d.ZERO);
         entity.setSneaking(false);
@@ -201,6 +197,6 @@ public class Acrobatics implements Tickable, NbtSerialisable {
     @Override
     public void fromNBT(NbtCompound compound) {
         ticksHanging = compound.getInt("ticksHanging");
-        tracker.set(hangingPos, NbtSerialisable.BLOCK_POS.readOptional("hangingPosition", compound));
+        hangingPos.set(NbtSerialisable.BLOCK_POS.readOptional("hangingPosition", compound));
     }
 }

src/main/java/com/minelittlepony/unicopia/entity/player/ManaContainer.java

@@ -8,8 +8,6 @@ import com.minelittlepony.unicopia.network.track.TrackableDataType;
 import com.minelittlepony.unicopia.util.Copyable;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
 import com.minelittlepony.unicopia.util.Tickable;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
-
 import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.math.MathHelper;
 
@@ -153,7 +151,6 @@ class ManaContainer implements MagicReserves, Tickable, NbtSerialisable, Copyabl
     }
 
     class BarInst implements Bar, NbtSerialisable {
-        private final DataTracker tracker;
         private final DataTracker.Entry<Float> marker;
         private final float max;
 
@@ -162,17 +159,16 @@ class ManaContainer implements MagicReserves, Tickable, NbtSerialisable, Copyabl
         private float prevValue;
 
         BarInst(DataTracker tracker, float max, float initial) {
-            this.tracker = tracker;
             this.max = max;
             this.trailingValue = initial;
             this.prevTrailingValue = initial;
             this.prevValue = initial;
-            this.marker = tracker.startTracking(TrackableDataType.of(PacketCodec.FLOAT), max * trailingValue);
+            this.marker = tracker.startTracking(TrackableDataType.FLOAT, max * trailingValue);
         }
 
         @Override
         public float get() {
-            return applyLimits(tracker.get(marker));
+            return applyLimits(marker.get());
         }
 
         @Override
@@ -191,7 +187,7 @@ class ManaContainer implements MagicReserves, Tickable, NbtSerialisable, Copyabl
         }
 
         private void load(float value) {
-            tracker.set(marker, value);
+            marker.set(value);
         }
 
         protected float getInitial(float initial) {

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerLevelStore.java

@@ -3,8 +3,6 @@ package com.minelittlepony.unicopia.entity.player;
 import com.minelittlepony.unicopia.ability.magic.Levelled;
 import com.minelittlepony.unicopia.network.track.DataTracker;
 import com.minelittlepony.unicopia.network.track.TrackableDataType;
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
-
 import net.minecraft.sound.*;
 import net.minecraft.util.math.MathHelper;
 
@@ -12,7 +10,6 @@ class PlayerLevelStore implements Levelled.LevelStore {
 
     private final Pony pony;
 
-    private final DataTracker tracker;
     private final DataTracker.Entry<Integer> dataEntry;
 
     private final boolean upgradeMana;
@@ -21,8 +18,7 @@ class PlayerLevelStore implements Levelled.LevelStore {
 
     PlayerLevelStore(Pony pony, DataTracker tracker, boolean upgradeMana, SoundEvent levelUpSound) {
         this.pony = pony;
-        this.tracker = tracker;
+        this.dataEntry = tracker.startTracking(TrackableDataType.INT, 0);
-        this.dataEntry = tracker.startTracking(TrackableDataType.of(PacketCodec.INT), 0);
         this.upgradeMana = upgradeMana;
         this.levelUpSound = levelUpSound;
     }
@@ -45,11 +41,11 @@ class PlayerLevelStore implements Levelled.LevelStore {
 
     @Override
     public int get() {
-        return tracker.get(dataEntry);
+        return dataEntry.get();
     }
 
     @Override
     public void set(int level) {
-        tracker.set(dataEntry, MathHelper.clamp(level, 0, getMax()));
+        dataEntry.set(MathHelper.clamp(level, 0, getMax()));
     }
 }

src/main/java/com/minelittlepony/unicopia/entity/player/Pony.java

@@ -35,7 +35,6 @@ import com.minelittlepony.unicopia.item.enchantment.UEnchantments;
 import com.minelittlepony.unicopia.util.*;
 import com.minelittlepony.unicopia.network.*;
 import com.minelittlepony.unicopia.network.track.DataTracker;
-import com.minelittlepony.unicopia.network.track.TrackableDataType;
 import com.minelittlepony.unicopia.server.world.UGameRules;
 import com.minelittlepony.common.util.animation.LinearInterpolator;
 import com.google.common.collect.Streams;
@@ -117,8 +116,8 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
                 sender.accept(Channel.SERVER_PLAYER_CAPABILITIES.toPacket(new MsgPlayerCapabilities(this)));
             }
         });
-        race = this.tracker.startTracking(TrackableDataType.of(Race.PACKET_CODEC), Race.HUMAN);
+        race = this.tracker.startTracking(Race.TRACKABLE_TYPE, Race.HUMAN);
-        suppressedRace = this.tracker.startTracking(TrackableDataType.of(Race.PACKET_CODEC), Race.HUMAN);
+        suppressedRace = this.tracker.startTracking(Race.TRACKABLE_TYPE, Race.HUMAN);
         this.levels = new PlayerLevelStore(this, tracker, true, USounds.Vanilla.ENTITY_PLAYER_LEVELUP);
         this.corruption = new PlayerLevelStore(this, tracker, false, USounds.ENTITY_PLAYER_CORRUPTION);
         this.mana = addTicker(new ManaContainer(this, tracker));
@@ -203,7 +202,7 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
      */
     @Override
     public Race getSpecies() {
-        return tracker.get(race);
+        return race.get();
     }
 
     /**
@@ -227,7 +226,7 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
     public void setSpecies(Race race) {
         race = race.validate(entity);
         Race current = getSpecies();
-        tracker.set(this.race, race);
+        this.race.set(race);
         if (race != current) {
             clearSuppressedRace();
         }
@@ -240,7 +239,7 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
     }
 
     public void setSuppressedRace(Race race) {
-        tracker.set(suppressedRace, race.validate(entity));
+        suppressedRace.set(race.validate(entity));
     }
 
     public void clearSuppressedRace() {
@@ -248,7 +247,7 @@ public class Pony extends Living<PlayerEntity> implements Copyable<Pony>, Update
     }
 
     public Race getSuppressedRace() {
-        return tracker.get(suppressedRace);
+        return suppressedRace.get();
     }
 
     public TraitDiscovery getDiscoveries() {

src/main/java/com/minelittlepony/unicopia/network/track/DataTracker.java

@@ -5,8 +5,6 @@ import java.util.List;
 import java.util.Objects;
 import org.jetbrains.annotations.Nullable;
 
-import com.minelittlepony.unicopia.util.serialization.PacketCodec;
-
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
@@ -31,13 +29,13 @@ public class DataTracker {
     }
 
     public <T extends TrackableObject> Entry<NbtCompound> startTracking(T value) {
-        Entry<NbtCompound> entry = startTracking(TrackableDataType.of(PacketCodec.NBT), value.toTrackedNbt());
+        Entry<NbtCompound> entry = startTracking(TrackableDataType.NBT, value.toTrackedNbt());
         persistentObjects.put(entry.id(), value);
         return entry;
     }
 
     public <T> Entry<T> startTracking(TrackableDataType<T> type, T initialValue) {
-        Entry<T> entry = new Entry<>(codecs.size());
+        Entry<T> entry = new Entry<>(this, codecs.size());
         codecs.add(new Pair<>(entry.id(), type, initialValue));
         return entry;
     }
@@ -47,11 +45,11 @@ public class DataTracker {
         return (Pair<T>)codecs.get(entry.id());
     }
 
-    public <T> T get(Entry<T> entry) {
+    private <T> T get(Entry<T> entry) {
         return getPair(entry).value;
     }
 
-    public <T> void set(Entry<T> entry, T value) {
+    private <T> void set(Entry<T> entry, T value) {
         if (manager.isClient) {
             return;
         }
@@ -128,7 +126,15 @@ public class DataTracker {
         }
     }
 
-    public record Entry<T>(int id) {}
+    public record Entry<T>(DataTracker tracker, int id) {
+        public T get() {
+            return tracker.get(this);
+        }
+
+        public void set(T t) {
+            tracker.set(this, t);
+        }
+    }
     static class Pair<T> {
         private final TrackableDataType<T> type;
         public final int id;
@@ -142,7 +148,7 @@ public class DataTracker {
 
         public Pair(PacketByteBuf buffer) {
             this.id = buffer.readInt();
-            this.type = TrackableDataType.of(buffer.readInt());
+            this.type = TrackableDataType.of(buffer);
             this.value = type.read(buffer);
         }
 

src/main/java/com/minelittlepony/unicopia/network/track/TrackableDataType.java

@@ -1,30 +1,40 @@
 package com.minelittlepony.unicopia.network.track;
 
-import java.util.ArrayList;
+import com.minelittlepony.unicopia.Race;
-import java.util.List;
+import com.minelittlepony.unicopia.Unicopia;
-
-import com.google.common.collect.Interner;
-import com.google.common.collect.Interners;
 import com.minelittlepony.unicopia.util.serialization.PacketCodec;
 
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.network.PacketByteBuf;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.BlockPos;
 
 public record TrackableDataType<T>(int id, PacketCodec<T> codec) {
-    private static final List<TrackableDataType<?>> REGISTRY = new ArrayList<>();
+    private static final Int2ObjectMap<TrackableDataType<?>> REGISTRY = new Int2ObjectOpenHashMap<>();
-    private static final Interner<TrackableDataType<?>> INTERNER = Interners.newStrongInterner();
+
+    public static final TrackableDataType<Integer> INT = of(new Identifier("integer"), PacketCodec.INT);
+    public static final TrackableDataType<Float> FLOAT = of(new Identifier("float"), PacketCodec.FLOAT);
+    public static final TrackableDataType<Boolean> BOOLEAN = of(new Identifier("boolean"), PacketCodec.BOOLEAN);
+    public static final TrackableDataType<UUID> UUID = of(new Identifier("uuid"), PacketCodec.UUID);
+    public static final TrackableDataType<NbtCompound> NBT = of(new Identifier("nbt"), PacketCodec.NBT);
+
+    public static final TrackableDataType<Optional<BlockPos>> OPTIONAL_POS = of(new Identifier("optional_pos"), PacketCodec.OPTIONAL_POS);
+    public static final TrackableDataType<Race> RACE = TrackableDataType.of(Unicopia.id("race"), PacketCodec.ofRegistry(Race.REGISTRY));
 
     @SuppressWarnings("unchecked")
-    public static <T> TrackableDataType<T> of(int id) {
+    public static <T> TrackableDataType<T> of(PacketByteBuf buffer) {
-        return (TrackableDataType<T>)REGISTRY.get(id);
+        int id = buffer.readInt();
+        return Objects.requireNonNull((TrackableDataType<T>)REGISTRY.get(id), "Unknown trackable data type id: " + id);
     }
 
-    public static <T> TrackableDataType<T> of(PacketCodec<T> codec) {
     @SuppressWarnings("unchecked")
-        TrackableDataType<T> type = (TrackableDataType<T>) INTERNER.intern(new TrackableDataType<>(REGISTRY.size(), codec));
+    public static <T> TrackableDataType<T> of(Identifier typeName, PacketCodec<T> codec) {
-        if (type.id() == REGISTRY.size()) {
+        return (TrackableDataType<T>)REGISTRY.computeIfAbsent(typeName.hashCode(), t -> new TrackableDataType<>(t, codec));
-            REGISTRY.add(type);
-        }
-        return type;
     }
 
     public T read(PacketByteBuf buffer) {
@@ -32,7 +42,7 @@ public record TrackableDataType<T>(int id, PacketCodec<T> codec) {
     }
 
     public void write(PacketByteBuf buffer, T value) {
-        buffer.writeInt(id());
+        buffer.writeInt(id);
         codec().write(buffer, value);
     }
 }