Fix missing support for oversized stack serialization for stored items on an item stack (#8145)

Author: pupnewfster

src/api/java/mekanism/api/MekanismAPI.java

@@ -34,7 +34,7 @@ private MekanismAPI() {
     /**
      * The version of the api classes - may not always match the mod's version
      */
-    public static final String API_VERSION = "10.6.3";
+    public static final String API_VERSION = "10.6.4";
     /**
      * Mekanism's Mod ID
      */

src/api/java/mekanism/api/SerializerHelper.java

@@ -59,6 +59,14 @@ private SerializerHelper() {
           DataComponentPatch.CODEC.optionalFieldOf(SerializationConstants.COMPONENTS, DataComponentPatch.EMPTY).forGetter(ItemStack::getComponentsPatch)
     ).apply(instance, ItemStack::new)));
 
+    /**
+     * Custom codec to allow serializing an item stack without the upper bounds. Allows empty items
+     *
+     * @since 10.6.4
+     */
+    public static final Codec<ItemStack> OVERSIZED_ITEM_OPTIONAL_CODEC = ExtraCodecs.optionalEmptyMap(OVERSIZED_ITEM_CODEC)
+          .xmap(optional -> optional.orElse(ItemStack.EMPTY), stack -> stack.isEmpty() ? Optional.empty() : Optional.of(stack));
+
     /**
      * Helper similar to {@link ItemStack#save(Provider)} but with support for oversized stacks.
      *

src/main/java/mekanism/common/attachments/containers/item/AttachedItems.java

@@ -5,6 +5,7 @@
 import java.util.Collections;
 import java.util.List;
 import mekanism.api.SerializationConstants;
+import mekanism.api.SerializerHelper;
 import mekanism.api.annotations.NothingNullByDefault;
 import mekanism.common.attachments.containers.IAttachedContainers;
 import net.minecraft.core.NonNullList;
@@ -18,7 +19,7 @@ public record AttachedItems(List<ItemStack> containers) implements IAttachedCont
     public static final AttachedItems EMPTY = new AttachedItems(Collections.emptyList());
 
     public static final Codec<AttachedItems> CODEC = RecordCodecBuilder.create(instance -> instance.group(
-          ItemStack.OPTIONAL_CODEC.listOf().fieldOf(SerializationConstants.ITEMS).forGetter(AttachedItems::containers)
+          SerializerHelper.OVERSIZED_ITEM_OPTIONAL_CODEC.listOf().fieldOf(SerializationConstants.ITEMS).forGetter(AttachedItems::containers)
     ).apply(instance, AttachedItems::new));
     public static final StreamCodec<RegistryFriendlyByteBuf, AttachedItems> STREAM_CODEC = ItemStack.OPTIONAL_LIST_STREAM_CODEC
           .map(AttachedItems::new, AttachedItems::containers);