Bunch more moves, changes in how additional information for items works.

PkmnLib.Static/Item.cs

@@ -109,7 +109,9 @@ public interface IItem : INamedValue
     ISecondaryEffect? Effect { get; }
     ISecondaryEffect? BattleEffect { get; }
 
-    byte FlingPower { get; }
+    IReadOnlyDictionary<StringKey, object?> AdditionalData { get; }
+
+    bool TryGetAdditionalData<T>(StringKey key, out T? value);
 
     /// <summary>
     /// Checks whether the item has a specific flag.
@@ -124,7 +126,8 @@ public class ItemImpl : IItem
 {
     /// <inheritdoc cref="ItemImpl"/>
     public ItemImpl(StringKey name, ItemCategory category, BattleItemCategory battleCategory, int price,
-        IEnumerable<StringKey> flags, ISecondaryEffect? effect, ISecondaryEffect? battleTriggerEffect, byte flingPower)
+        IEnumerable<StringKey> flags, ISecondaryEffect? effect, ISecondaryEffect? battleTriggerEffect,
+        Dictionary<StringKey, object?> additionalData)
     {
         Name = name;
         Category = category;
@@ -132,7 +135,7 @@ public class ItemImpl : IItem
         Price = price;
         Effect = effect;
         BattleEffect = battleTriggerEffect;
-        FlingPower = flingPower;
+        AdditionalData = additionalData;
         Flags = [..flags];
     }
 
@@ -158,7 +161,35 @@ public class ItemImpl : IItem
     public ISecondaryEffect? BattleEffect { get; }
 
     /// <inheritdoc />
-    public byte FlingPower { get; }
+    public IReadOnlyDictionary<StringKey, object?> AdditionalData { get; }
+
+    /// <inheritdoc />
+    public bool TryGetAdditionalData<T>(StringKey key, out T? value)
+    {
+        if (AdditionalData.TryGetValue(key, out var obj))
+        {
+            switch (obj)
+            {
+                case T t:
+                    value = t;
+                    return true;
+                case IConvertible convertible:
+                    try
+                    {
+                        value = (T)convertible.ToType(typeof(T), null);
+                        return true;
+                    }
+                    catch (InvalidCastException)
+                    {
+                        // Ignore
+                    }
+                    break;
+            }
+        }
+
+        value = default;
+        return false;
+    }
 
     /// <inheritdoc />
     public bool HasFlag(string key) => Flags.Contains(key);