--- a/net/minecraft/network/PacketDataSerializer.java
+++ b/net/minecraft/network/PacketDataSerializer.java
@@ -139,7 +139,7 @@
 
     public <T, C extends Collection<T>> C readCollection(IntFunction<C> intfunction, StreamDecoder<? super PacketDataSerializer, T> streamdecoder) {
         int i = this.readVarInt();
-        C c0 = (Collection) intfunction.apply(i);
+        C c0 = intfunction.apply(i); // CraftBukkit - decompile error
 
         for (int j = 0; j < i; ++j) {
             c0.add(streamdecoder.decode(this));
@@ -150,7 +150,7 @@
 
     public <T> void writeCollection(Collection<T> collection, StreamEncoder<? super PacketDataSerializer, T> streamencoder) {
         this.writeVarInt(collection.size());
-        Iterator iterator = collection.iterator();
+        Iterator<T> iterator = collection.iterator(); // CraftBukkit - decompile error
 
         while (iterator.hasNext()) {
             T t0 = iterator.next();
@@ -177,12 +177,12 @@
 
     public void writeIntIdList(IntList intlist) {
         this.writeVarInt(intlist.size());
-        intlist.forEach(this::writeVarInt);
+        intlist.forEach((java.util.function.IntConsumer) this::writeVarInt); // CraftBukkit - decompile error
     }
 
     public <K, V, M extends Map<K, V>> M readMap(IntFunction<M> intfunction, StreamDecoder<? super PacketDataSerializer, K> streamdecoder, StreamDecoder<? super PacketDataSerializer, V> streamdecoder1) {
         int i = this.readVarInt();
-        M m0 = (Map) intfunction.apply(i);
+        M m0 = intfunction.apply(i); // CraftBukkit - decompile error
 
         for (int j = 0; j < i; ++j) {
             K k0 = streamdecoder.decode(this);
@@ -216,7 +216,7 @@
     }
 
     public <E extends Enum<E>> void writeEnumSet(EnumSet<E> enumset, Class<E> oclass) {
-        E[] ae = (Enum[]) oclass.getEnumConstants();
+        E[] ae = oclass.getEnumConstants(); // CraftBukkit - decompile error
         BitSet bitset = new BitSet(ae.length);
 
         for (int i = 0; i < ae.length; ++i) {
@@ -227,7 +227,7 @@
     }
 
     public <E extends Enum<E>> EnumSet<E> readEnumSet(Class<E> oclass) {
-        E[] ae = (Enum[]) oclass.getEnumConstants();
+        E[] ae = oclass.getEnumConstants(); // CraftBukkit - decompile error
         BitSet bitset = this.readFixedBitSet(ae.length);
         EnumSet<E> enumset = EnumSet.noneOf(oclass);
 
@@ -482,7 +482,7 @@
     }
 
     public <T extends Enum<T>> T readEnum(Class<T> oclass) {
-        return ((Enum[]) oclass.getEnumConstants())[this.readVarInt()];
+        return ((T[]) oclass.getEnumConstants())[this.readVarInt()]; // CraftBukkit - fix decompile error
     }
 
     public PacketDataSerializer writeEnum(Enum<?> oenum) {
@@ -549,7 +549,7 @@
 
         try {
             NBTCompressedStreamTools.writeAnyTag((NBTBase) nbtbase, new ByteBufOutputStream(bytebuf));
-        } catch (IOException ioexception) {
+        } catch (Exception ioexception) { // CraftBukkit - IOException -> Exception
             throw new EncoderException(ioexception);
         }
     }