1.21.5

Co-authored-by: Bjarne Koll <git@lynxplay.dev>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: Lulu13022002 <41980282+Lulu13022002@users.noreply.github.com>
Co-authored-by: MiniDigger | Martin <admin@minidigger.dev>
Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>
Co-authored-by: Noah van der Aa <ndvdaa@gmail.com>
Co-authored-by: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>
Co-authored-by: Tamion <70228790+notTamion@users.noreply.github.com>
Co-authored-by: Warrior <50800980+Warriorrrr@users.noreply.github.com>

paper-api/src/main/java/org/bukkit/UnsafeValues.java

@@ -23,6 +23,7 @@ import org.bukkit.potion.PotionType;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import java.util.Map;
 
 /**
  * This interface provides value conversions that may be specific to a
@@ -142,9 +143,6 @@ public interface UnsafeValues {
     @ApiStatus.Internal
     <B extends Keyed> B get(RegistryKey<B> registry, NamespacedKey key);
 
-    @ApiStatus.Internal
-    Biome getCustomBiome();
-
     // Paper start
     @Deprecated(forRemoval = true)
     boolean isSupportedApiVersion(String apiVersion);
@@ -382,4 +380,8 @@ public interface UnsafeValues {
     @NotNull java.util.List<net.kyori.adventure.text.Component> computeTooltipLines(@NotNull ItemStack itemStack, @NotNull io.papermc.paper.inventory.tooltip.TooltipContext tooltipContext, @Nullable org.bukkit.entity.Player player); // Paper - expose itemstack tooltip lines
 
     ItemStack createEmptyStack(); // Paper - proxy ItemStack
+
+    @NotNull Map<String, Object> serializeStack(ItemStack itemStack);
+
+    @NotNull ItemStack deserializeStack(@NotNull Map<String, Object> args);
 }