serialize mattery container as ListTag

since we don't care about size

src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/CargoCrateBlockEntity.kt

@@ -64,7 +64,7 @@ class CargoCrateBlockEntity(
 
 	override fun load(nbt: CompoundTag) {
 		super.load(nbt)
-		nbt.ifHas("slots", CompoundTag::class.java, container::deserializeNBT)
+		container.deserializeNBT(nbt["slots"])
 	}
 
 	override val defaultDisplayName: Component

src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/MatteryPoweredBlockEntity.kt

@@ -85,7 +85,7 @@ abstract class MatteryPoweredBlockEntity(p_155228_: BlockEntityType<*>, p_155229
 
 	override fun load(nbt: CompoundTag) {
 		nbt.ifHas("energy", CompoundTag::class.java, energy::deserializeNBT)
-		nbt.ifHas("battery_container", CompoundTag::class.java, batteryContainer::deserializeNBT)
+		batteryContainer.deserializeNBT(nbt["battery_container"])
 		super.load(nbt)
 	}
 }

src/main/kotlin/ru/dbotthepony/mc/otm/capability/MatteryPlayerCapability.kt

@@ -54,11 +54,12 @@ class MatteryPlayerCapability(val ply: Player) : ICapabilityProvider, IMatteryEn
 	var hasExoSuit by synchronizer.bool()
 
 	var exoSuitSlotCount by synchronizer.int(setter = setter@{ value, access, _ ->
-		require(value > 0) { "Invalid slot count $value" }
+		require(value >= 0) { "Invalid slot count $value" }
 
 		if (value != access.read()) {
 			access.write(value)
 			_exoSuitMenu = null
+			exoSuitContainer = MatteryContainer(value)
 		}
 	})
 

src/main/kotlin/ru/dbotthepony/mc/otm/container/MatteryContainer.kt

@@ -20,6 +20,10 @@ open class MatteryContainer(val watcher: Runnable, private val size: Int) : Cont
 	constructor(watcher: BlockEntity, size: Int) : this(watcher::setChanged, size)
 	constructor(size: Int) : this({}, size)
 
+	init {
+		require(size >= 0) { "Invalid container size $size" }
+	}
+
 	private var ignoreChangeNotifications = 0
 	protected val slots: Array<ItemStack> = Array(size) { ItemStack.EMPTY }
 	private val trackedSlots: Array<ItemStack> = Array(size) { ItemStack.EMPTY }
@@ -41,7 +45,7 @@ open class MatteryContainer(val watcher: Runnable, private val size: Int) : Cont
 	protected open fun startedIgnoringUpdates() {}
 	protected open fun stoppedIgnoringUpdates() {}
 
-	fun deserializeNBT(tag: CompoundTag?) {
+	private fun deserializeNBT(tag: CompoundTag?) {
 		Arrays.fill(slots, ItemStack.EMPTY)
 
 		if (tag == null) {
@@ -59,8 +63,31 @@ open class MatteryContainer(val watcher: Runnable, private val size: Int) : Cont
 		setChanged()
 	}
 
+	fun deserializeNBT(tag: ListTag?) {
+		Arrays.fill(slots, ItemStack.EMPTY)
+
+		if (tag == null) {
+			setChanged()
+			return
+		}
+
+		// нам не интересен размер
+		for (i in 0 until tag.size.coerceAtMost(size)) {
+			slots[i] = ItemStack.of(tag[i] as CompoundTag)
+		}
+
+		setChanged()
+	}
+
 	fun deserializeNBT(tag: Tag?) {
-		deserializeNBT(tag as CompoundTag?)
+		if (tag is CompoundTag) {
+			deserializeNBT(tag)
+		} else if (tag is ListTag) {
+			deserializeNBT(tag)
+		} else {
+			Arrays.fill(slots, ItemStack.EMPTY)
+			setChanged()
+		}
 	}
 
 	fun stacks(): ContainerIteratorItemStack {
@@ -97,17 +124,12 @@ open class MatteryContainer(val watcher: Runnable, private val size: Int) : Cont
 		if (ignoreChangeNotifications == 0) watcher.run()
 	}
 
-	fun serializeNBT(): CompoundTag {
-		val tag = CompoundTag()
-		tag["size"] = size
-
-		val list = ListTag()
-		tag["items"] = list
-
-		for (i in 0 until size)
-			list.add(this[i].serializeNBT())
-
-		return tag
+	fun serializeNBT(): ListTag {
+		return ListTag().also {
+			for (i in 0 until size) {
+				it.add(this[i].serializeNBT())
+			}
+		}
 	}
 
 	fun hasEmptySlot(): Boolean {