diff --git a/src/Collections/EcsGroup.cs b/src/Collections/EcsGroup.cs
index bccdd07..09c4be3 100644
--- a/src/Collections/EcsGroup.cs
+++ b/src/Collections/EcsGroup.cs
@@ -229,8 +229,7 @@ namespace DCFApixels.DragonECS
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _isReleased; }
         }
-
-        bool ICollection<int>.IsReadOnly => throw new NotImplementedException();
+        bool ICollection<int>.IsReadOnly { get { return false; } }
 
         public int this[int index]
         {
@@ -473,7 +472,7 @@ namespace DCFApixels.DragonECS
         }
         /// <summary>as Union sets</summary>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public void UnionWith(EcsReadonlyGroup group) => UnionWith(group.GetSource_Internal());
+        public void UnionWith(EcsReadonlyGroup group) { UnionWith(group.GetSource_Internal()); }
         /// <summary>as Union sets</summary>
         public void UnionWith(EcsSpan span)
         {
@@ -1226,19 +1225,14 @@ namespace DCFApixels.DragonECS
             public int Current
             {
                 [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                get => _dense[_index];
+                get { return _dense[_index]; }
             }
             object IEnumerator.Current { get { return Current; } }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext()
-            {
-                // проверка с учтом что отсчет начинается с индекса 1 
-                return --_index > 0;
-            }
+            public bool MoveNext() { return --_index > 0; }  // проверка с учтом что отсчет начинается с индекса 1 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Dispose() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Reset() { }
+            void IDisposable.Dispose() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
         #endregion
 
diff --git a/src/DataInterfaces.cs b/src/DataInterfaces.cs
index 66f4c12..986dcf5 100644
--- a/src/DataInterfaces.cs
+++ b/src/DataInterfaces.cs
@@ -62,9 +62,9 @@ namespace DCFApixels.DragonECS
         private sealed class DummyHandler : IEcsComponentLifecycle<T>
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Enable(ref T component) => component = default;
+            public void Enable(ref T component) { component = default; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Disable(ref T component) => component = default;
+            public void Disable(ref T component) { component = default; }
         }
     }
     #endregion
@@ -95,7 +95,7 @@ namespace DCFApixels.DragonECS
         private sealed class DummyHandler : IEcsComponentCopy<T>
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Copy(ref T from, ref T to) => to = from;
+            public void Copy(ref T from, ref T to) { to = from; }
         }
     }
     #endregion
diff --git a/src/EcsMask.cs b/src/EcsMask.cs
index bbb9244..0b03864 100644
--- a/src/EcsMask.cs
+++ b/src/EcsMask.cs
@@ -460,7 +460,7 @@ namespace DCFApixels.DragonECS
                 return true;
             }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public override int GetHashCode() => hash;
+            public override int GetHashCode() { return hash; }
             #endregion
         }
 
diff --git a/src/EcsPipeline.cs b/src/EcsPipeline.cs
index 5e94ca8..e7ecf07 100644
--- a/src/EcsPipeline.cs
+++ b/src/EcsPipeline.cs
@@ -429,7 +429,7 @@ namespace DCFApixels.DragonECS
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public void Reset() { _index = -1; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Dispose() { }
+            void IDisposable.Dispose() { }
         }
         #endregion
 
diff --git a/src/EcsWorld.cache.cs b/src/EcsWorld.cache.cs
index 8ee4d57..4a2fafd 100644
--- a/src/EcsWorld.cache.cs
+++ b/src/EcsWorld.cache.cs
@@ -8,7 +8,7 @@ namespace DCFApixels.DragonECS
             where T : IEcsPoolImplementation, new()
         {
             public readonly T instance;
-            public PoolCache(T instance) => this.instance = instance;
+            public PoolCache(T instance) { this.instance = instance; }
             void IEcsWorldComponent<PoolCache<T>>.Init(ref PoolCache<T> component, EcsWorld world)
             {
                 component = new PoolCache<T>(world.CreatePool<T>());
@@ -22,7 +22,7 @@ namespace DCFApixels.DragonECS
             where T : EcsAspect, new()
         {
             public readonly T instance;
-            public AspectCache(T instance) => this.instance = instance;
+            public AspectCache(T instance) { this.instance = instance; }
             void IEcsWorldComponent<AspectCache<T>>.Init(ref AspectCache<T> component, EcsWorld world)
             {
                 component = new AspectCache<T>(EcsAspect.Builder.New<T>(world));
@@ -36,7 +36,7 @@ namespace DCFApixels.DragonECS
             where T : EcsQueryExecutor, new()
         {
             public readonly T instance;
-            public ExeccutorCache(T instance) => this.instance = instance;
+            public ExeccutorCache(T instance) { this.instance = instance; }
             void IEcsWorldComponent<ExeccutorCache<T>>.Init(ref ExeccutorCache<T> component, EcsWorld world)
             {
                 T instance = new T();
diff --git a/src/EcsWorld.static.cs b/src/EcsWorld.static.cs
index 1738223..c056edb 100644
--- a/src/EcsWorld.static.cs
+++ b/src/EcsWorld.static.cs
@@ -10,9 +10,9 @@ namespace DCFApixels.DragonECS
     public struct EcsWorldCmp<T> where T : struct
     {
         private short _worldID;
-        public EcsWorldCmp(short worldID) => _worldID = worldID;
-        public EcsWorld World => EcsWorld.GetWorld(_worldID);
-        public ref T Value => ref EcsWorld.GetData<T>(_worldID);
+        public EcsWorldCmp(short worldID) { _worldID = worldID; }
+        public EcsWorld World { get { return EcsWorld.GetWorld(_worldID); } }
+        public ref T Value { get { return ref EcsWorld.GetData<T>(_worldID); } }
     }
     public partial class EcsWorld
     {
diff --git a/src/Internal/ArrayUtility.cs b/src/Internal/ArrayUtility.cs
index 8267d2a..a757552 100644
--- a/src/Internal/ArrayUtility.cs
+++ b/src/Internal/ArrayUtility.cs
@@ -11,52 +11,6 @@ namespace DCFApixels.DragonECS.Internal
     {
         int Next { get; }
     }
-    internal readonly struct LinkedIndexesIterator<T> : IEnumerable<int>
-        where T : ILinkedNext
-    {
-        private readonly T[] _array;
-        private readonly int _count;
-        private readonly int _startIndex;
-        public LinkedIndexesIterator(T[] array, int count, int startIndex)
-        {
-            _array = array;
-            _count = count;
-            _startIndex = startIndex;
-        }
-        public Enumerator GetEnumerator()
-        {
-            return new Enumerator(_array, _count, _startIndex);
-        }
-        IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
-        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
-        public struct Enumerator : IEnumerator<int>
-        {
-            private readonly T[] _array;
-            private readonly int _count;
-            private int _index;
-            private int _counter;
-            public Enumerator(T[] array, int count, int index)
-            {
-                _array = array;
-                _count = count;
-                _index = index;
-                _counter = 0;
-            }
-            public int Current { get { return _index; } }
-            object IEnumerator.Current { get { return Current; } }
-            public bool MoveNext()
-            {
-                if (++_counter > _count) { return false; }
-                if (_counter > 1)
-                {
-                    _index = _array[_index].Next;
-                }
-                return true;
-            }
-            public void Dispose() { }
-            public void Reset() { }
-        }
-    }
     internal readonly struct LinkedListIterator<T> : IEnumerable<T>
         where T : ILinkedNext
     {
@@ -88,7 +42,11 @@ namespace DCFApixels.DragonECS.Internal
                 _index = index;
                 _counter = 0;
             }
-            public ref readonly T Current { get { return ref _array[_index]; } }
+            public ref T Current
+            {
+                [MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get { return ref _array[_index]; }
+            }
             T IEnumerator<T>.Current { get { return _array[_index]; } }
             object IEnumerator.Current { get { return Current; } }
             public bool MoveNext()
@@ -100,10 +58,12 @@ namespace DCFApixels.DragonECS.Internal
                 }
                 return true;
             }
-            public void Dispose() { }
-            public void Reset() { throw new NotSupportedException(); }
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            void IDisposable.Dispose() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
     }
+
     internal static class ArrayUtility
     {
         private static int GetHighBitNumber(uint bits)
@@ -183,12 +143,12 @@ namespace DCFApixels.DragonECS.Internal
             this.start = start;
             this.length = length;
         }
-        public static EnumerableInt Range(int start, int length) => new EnumerableInt(start, length);
-        public static EnumerableInt StartEnd(int start, int end) => new EnumerableInt(start, end - start);
-        IEnumerator<int> IEnumerable<int>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        public static EnumerableInt Range(int start, int length) { return new EnumerableInt(start, length); }
+        public static EnumerableInt StartEnd(int start, int end) { return new EnumerableInt(start, end - start); }
+        IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
+        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Enumerator GetEnumerator() => new Enumerator(start, start + length);
+        public Enumerator GetEnumerator() { return new Enumerator(start, start + length); }
         public struct Enumerator : IEnumerator<int>
         {
             private readonly int _max;
@@ -202,16 +162,16 @@ namespace DCFApixels.DragonECS.Internal
             public int Current
             {
                 [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                get => _current;
+                get { return _current; }
             }
-            object IEnumerator.Current => Current;
+            object IEnumerator.Current { get { return Current; } }
 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext() => ++_current < _max;
+            public bool MoveNext() { return ++_current < _max; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Reset() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Dispose() { }
+            void IDisposable.Dispose() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
+
         }
     }
     internal static unsafe class UnmanagedArrayUtility
diff --git a/src/Internal/BitsUtility.cs b/src/Internal/BitsUtility.cs
index 2e06d1b..f96435e 100644
--- a/src/Internal/BitsUtility.cs
+++ b/src/Internal/BitsUtility.cs
@@ -512,9 +512,9 @@ namespace DCFApixels.DragonECS.Internal
             byte result = ToByte(bitsString);
             return *(bool*)&result;
         }
-        public static short ToShort(string bitsString) => (short)ToUShort(bitsString);
-        public static int ToInt(string bitsString) => (int)ToUInt(bitsString);
-        public static long ToLong(string bitsString) => (long)ToULong(bitsString);
+        public static short ToShort(string bitsString) { return (short)ToUShort(bitsString); }
+        public static int ToInt(string bitsString) { return (int)ToUInt(bitsString); }
+        public static long ToLong(string bitsString) { return (long)ToULong(bitsString); }
         #endregion
 
         #region XorShift
@@ -625,249 +625,18 @@ namespace DCFApixels.DragonECS.Internal
         #endregion
     }
 
-    #region FindBitsResult removed
-    /*
-    public unsafe struct FindBitsResult8 : IEnumerable<byte>
-    {
-        private fixed byte _numbers[8];
-        public readonly byte Count;
-        public int this[int index]
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _numbers[index];
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResult8(uint bits)
-        {
-            unchecked
-            {
-                Count = (byte)CountBits(bits);
-                for (int i = 0; i < Count; i++)
-                {
-                    int number = GetHighBitNumber(bits);
-                    _numbers[i] = (byte)number;
-                    bits ^= 1u << number;
-                }
-            }
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static ReadOnlySpan<byte> CreateSpanInternal(FindBitsResult8 a)
-        {
-            return new ReadOnlySpan<byte>(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public ReadOnlySpan<byte> ToSpan()
-        {
-            return CreateSpanInternal(this);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static FindBitsResultEnumerator GetEnumeratorInternal(FindBitsResult8 a)
-        {
-            return new FindBitsResultEnumerator(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResultEnumerator GetEnumerator()
-        {
-            return GetEnumeratorInternal(this);
-        }
-        IEnumerator<byte> IEnumerable<byte>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
-    }
-    
-    public unsafe struct FindBitsResult16 : IEnumerable<byte>
-    {
-        private fixed byte _numbers[16];
-        public readonly byte Count;
-        public int this[int index]
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _numbers[index];
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResult16(uint bits)
-        {
-            unchecked
-            {
-                Count = (byte)CountBits(bits);
-                for (int i = 0; i < Count; i++)
-                {
-                    int number = GetHighBitNumber(bits);
-                    _numbers[i] = (byte)number;
-                    bits ^= 1u << number;
-                }
-            }
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static ReadOnlySpan<byte> CreateSpanInternal(FindBitsResult16 a)
-        {
-            return new ReadOnlySpan<byte>(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public ReadOnlySpan<byte> ToSpan()
-        {
-            return CreateSpanInternal(this);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static FindBitsResultEnumerator GetEnumeratorInternal(FindBitsResult16 a)
-        {
-            return new FindBitsResultEnumerator(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResultEnumerator GetEnumerator()
-        {
-            return GetEnumeratorInternal(this);
-        }
-        IEnumerator<byte> IEnumerable<byte>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
-    }
-    
-    public unsafe struct FindBitsResult32 : IEnumerable<byte>
-    {
-        public fixed byte _numbers[32];
-        public readonly byte Count;
-        public int this[int index]
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _numbers[index];
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResult32(uint bits)
-        {
-            unchecked
-            {
-                Count = (byte)CountBits(bits);
-                for (int i = 0; i < Count; i++)
-                {
-                    int number = GetHighBitNumber(bits);
-                    _numbers[i] = (byte)number;
-                    bits ^= 1u << number;
-                }
-            }
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static ReadOnlySpan<byte> CreateSpanInternal(FindBitsResult32 a)
-        {
-            return new ReadOnlySpan<byte>(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public ReadOnlySpan<byte> ToSpan()
-        {
-            return CreateSpanInternal(this);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static FindBitsResultEnumerator GetEnumeratorInternal(FindBitsResult32 a)
-        {
-            return new FindBitsResultEnumerator(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResultEnumerator GetEnumerator()
-        {
-            return GetEnumeratorInternal(this);
-        }
-        IEnumerator<byte> IEnumerable<byte>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
-    }
-    
-    public unsafe struct FindBitsResult64 : IEnumerable<byte>
-    {
-        private fixed byte _numbers[64];
-        public readonly byte Count;
-        public int this[int index]
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _numbers[index];
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResult64(ulong bits)
-        {
-            unchecked
-            {
-                Count = (byte)CountBits(bits);
-                for (int i = 0; i < Count; i++)
-                {
-                    int number = GetHighBitNumber(bits);
-                    _numbers[i] = (byte)number;
-                    bits ^= 1u << number;
-                }
-            }
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static ReadOnlySpan<byte> CreateSpanInternal(FindBitsResult64 a)
-        {
-            return new ReadOnlySpan<byte>(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public ReadOnlySpan<byte> ToSpan()
-        {
-            return CreateSpanInternal(this);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static FindBitsResultEnumerator GetEnumeratorInternal(FindBitsResult64 a)
-        {
-            return new FindBitsResultEnumerator(a._numbers, a.Count);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResultEnumerator GetEnumerator()
-        {
-            return GetEnumeratorInternal(this);
-        }
-        IEnumerator<byte> IEnumerable<byte>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
-    }
-
-    public unsafe struct FindBitsResultEnumerator : IEnumerator<byte>
-    {
-        private byte* _numbers;
-        private byte _count;
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsResultEnumerator(byte* numbers, byte count)
-        {
-            _numbers = numbers;
-            _count = count;
-        }
-        public byte Current
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get
-            {
-                return *_numbers;
-            }
-        }
-        object IEnumerator.Current => Current;
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public bool MoveNext()
-        {
-            return _count-- > 0;
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public void Dispose() { }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public void Reset() { }
-    }
-    */
-    #endregion
-
     #region FindBitsIterator
     public struct FindBitsIterator8 : IEnumerable<int>
     {
         private Enumerator _enumerator;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator8(sbyte bits)
-        {
-            _enumerator = new Enumerator((byte)bits);
-        }
+        public FindBitsIterator8(sbyte bits) { _enumerator = new Enumerator((byte)bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator8(byte bits)
-        {
-            _enumerator = new Enumerator(bits);
-        }
+        public FindBitsIterator8(byte bits) { _enumerator = new Enumerator(bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Enumerator GetEnumerator()
-        {
-            return _enumerator;
-        }
-        IEnumerator<int> IEnumerable<int>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        public Enumerator GetEnumerator() { return _enumerator; }
+        IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
+        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         public struct Enumerator : IEnumerator<int>
         {
             private uint _bits;
@@ -888,16 +657,12 @@ namespace DCFApixels.DragonECS.Internal
                     return number;
                 }
             }
-            object IEnumerator.Current => Current;
+            object IEnumerator.Current { get { return Current; } }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext()
-            {
-                return _count-- > 0;
-            }
+            public bool MoveNext() { return _count-- > 0; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             void IDisposable.Dispose() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            void IEnumerator.Reset() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
     }
 
@@ -905,22 +670,13 @@ namespace DCFApixels.DragonECS.Internal
     {
         private Enumerator _enumerator;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator16(short bits)
-        {
-            _enumerator = new Enumerator((ushort)bits);
-        }
+        public FindBitsIterator16(short bits) { _enumerator = new Enumerator((ushort)bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator16(ushort bits)
-        {
-            _enumerator = new Enumerator(bits);
-        }
+        public FindBitsIterator16(ushort bits) { _enumerator = new Enumerator(bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Enumerator GetEnumerator()
-        {
-            return _enumerator;
-        }
-        IEnumerator<int> IEnumerable<int>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        public Enumerator GetEnumerator() { return _enumerator; }
+        IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
+        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         public struct Enumerator : IEnumerator<int>
         {
             private uint _bits;
@@ -941,16 +697,12 @@ namespace DCFApixels.DragonECS.Internal
                     return number;
                 }
             }
-            object IEnumerator.Current => Current;
+            object IEnumerator.Current { get { return Current; } }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext()
-            {
-                return _count-- > 0;
-            }
+            public bool MoveNext() { return _count-- > 0; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             void IDisposable.Dispose() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            void IEnumerator.Reset() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
     }
 
@@ -958,22 +710,13 @@ namespace DCFApixels.DragonECS.Internal
     {
         private Enumerator _enumerator;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator32(int bits)
-        {
-            _enumerator = new Enumerator((uint)bits);
-        }
+        public FindBitsIterator32(int bits) { _enumerator = new Enumerator((uint)bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator32(uint bits)
-        {
-            _enumerator = new Enumerator(bits);
-        }
+        public FindBitsIterator32(uint bits) { _enumerator = new Enumerator(bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Enumerator GetEnumerator()
-        {
-            return _enumerator;
-        }
-        IEnumerator<int> IEnumerable<int>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        public Enumerator GetEnumerator() { return _enumerator; }
+        IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
+        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         public struct Enumerator : IEnumerator<int>
         {
             private uint _bits;
@@ -994,16 +737,12 @@ namespace DCFApixels.DragonECS.Internal
                     return number;
                 }
             }
-            object IEnumerator.Current => Current;
+            object IEnumerator.Current { get { return Current; } }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext()
-            {
-                return _count-- > 0;
-            }
+            public bool MoveNext() { return _count-- > 0; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             void IDisposable.Dispose() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            void IEnumerator.Reset() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
     }
 
@@ -1011,22 +750,13 @@ namespace DCFApixels.DragonECS.Internal
     {
         private Enumerator _enumerator;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator64(long bits)
-        {
-            _enumerator = new Enumerator((ulong)bits);
-        }
+        public FindBitsIterator64(long bits) { _enumerator = new Enumerator((ulong)bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public FindBitsIterator64(ulong bits)
-        {
-            _enumerator = new Enumerator(bits);
-        }
+        public FindBitsIterator64(ulong bits) { _enumerator = new Enumerator(bits); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Enumerator GetEnumerator()
-        {
-            return _enumerator;
-        }
-        IEnumerator<int> IEnumerable<int>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        public Enumerator GetEnumerator() { return _enumerator; }
+        IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
+        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         public struct Enumerator : IEnumerator<int>
         {
             private ulong _bits;
@@ -1047,16 +777,12 @@ namespace DCFApixels.DragonECS.Internal
                     return number;
                 }
             }
-            object IEnumerator.Current => Current;
+            object IEnumerator.Current { get { return Current; } }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext()
-            {
-                return _count-- > 0;
-            }
+            public bool MoveNext() { return _count-- > 0; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             void IDisposable.Dispose() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            void IEnumerator.Reset() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
     }
     #endregion
diff --git a/src/Internal/IdDispenser.cs b/src/Internal/IdDispenser.cs
index 412b2a4..cd978d4 100644
--- a/src/Internal/IdDispenser.cs
+++ b/src/Internal/IdDispenser.cs
@@ -261,10 +261,8 @@ namespace DCFApixels.DragonECS.Internal
         #endregion
 
         #region Enumerable
-        public Enumerator GetEnumerator()
-        {
-            return new Enumerator(_dense, 0, _usedCount);
-        }
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public Enumerator GetEnumerator() { return new Enumerator(_dense, 0, _usedCount); }
         IEnumerator<int> IEnumerable<int>.GetEnumerator() { return GetEnumerator(); }
         IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         public struct Enumerator : IEnumerator<int>
@@ -272,17 +270,25 @@ namespace DCFApixels.DragonECS.Internal
             private readonly int[] _dense;
             private readonly int _count;
             private int _index;
-            public int Current => _dense[_index];
-            object IEnumerator.Current => Current;
+            public int Current
+            {
+                [MethodImpl(MethodImplOptions.AggressiveInlining)]
+                get { return _dense[_index]; }
+            }
+            object IEnumerator.Current { get { return Current; } }
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public Enumerator(int[] dense, int startIndex, int count)
             {
                 _dense = dense;
                 _count = startIndex + count;
                 _index = startIndex - 1;
             }
-            public bool MoveNext() => ++_index < _count;
-            public void Dispose() { }
-            public void Reset() => _index = -1;
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            public bool MoveNext() { return ++_index < _count; }
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            void IDisposable.Dispose() { }
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            public void Reset() { _index = -1; }
         }
         #endregion
 
@@ -303,19 +309,15 @@ namespace DCFApixels.DragonECS.Internal
         private static class ThrowHalper
         {
             [MethodImpl(MethodImplOptions.NoInlining)]
-            public static void ThrowIsAlreadyInUse(int id) => throw new ArgumentException($"Id {id} is already in use.");
+            public static void ThrowIsAlreadyInUse(int id) { throw new ArgumentException($"Id {id} is already in use."); }
             [MethodImpl(MethodImplOptions.NoInlining)]
-            public static void ThrowIsHasBeenReserved(int id) => throw new ArgumentException($"Id {id} has been reserved.");
-
+            public static void ThrowIsHasBeenReserved(int id) { throw new ArgumentException($"Id {id} has been reserved."); }
             [MethodImpl(MethodImplOptions.NoInlining)]
-            public static void ThrowIsNotUsed(int id) => throw new ArgumentException($"Id {id} is not used.");
-
+            public static void ThrowIsNotUsed(int id) { throw new ArgumentException($"Id {id} is not used."); }
             [MethodImpl(MethodImplOptions.NoInlining)]
-            public static void ThrowIsNotAvailable(int id) => throw new ArgumentException($"Id {id} is not available.");
-
+            public static void ThrowIsNotAvailable(int id) { throw new ArgumentException($"Id {id} is not available."); }
             [MethodImpl(MethodImplOptions.NoInlining)]
-            public static void ThrowIsNullID(int id) => throw new ArgumentException($"Id {id} cannot be released because it is used as a null id.");
-
+            public static void ThrowIsNullID(int id) { throw new ArgumentException($"Id {id} cannot be released because it is used as a null id."); }
             [MethodImpl(MethodImplOptions.NoInlining)]
             public static void UndefinedException() { throw new Exception(); }
         }
diff --git a/src/Internal/SparseArray.cs b/src/Internal/SparseArray.cs
index b0d3f08..4854e82 100644
--- a/src/Internal/SparseArray.cs
+++ b/src/Internal/SparseArray.cs
@@ -32,15 +32,15 @@ namespace DCFApixels.DragonECS.Internal
         #region Properties
         public TValue this[int keyX, int keyY]
         {
-            get => _entries[FindEntry((keyX << 16) | keyY)].value;
-            set => Insert(keyX + (keyY << 16), value);
+            get { return _entries[FindEntry((keyX << 16) | keyY)].value; }
+            set { Insert(keyX + (keyY << 16), value); }
         }
         public TValue this[int key]
         {
-            get => _entries[FindEntry(key)].value;
-            set => Insert(key, value);
+            get { return _entries[FindEntry(key)].value; }
+            set { Insert(key, value); }
         }
-        public int Count => _count;
+        public int Count { get { return _count; } }
         #endregion
 
         #region Constructors
@@ -57,22 +57,21 @@ namespace DCFApixels.DragonECS.Internal
 
         #region Add/Contains/Remove
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public void Add(int keyX, int keyY, TValue value) => Add((keyX << 16) | keyY, value);
+        public void Add(int keyX, int keyY, TValue value) { Add((keyX << 16) | keyY, value); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void Add(int key, TValue value)
         {
 #if DEBUG
-            if (Contains(key))
-                throw new ArgumentException("Contains(hashKey) is true");
+            if (Contains(key)) { throw new ArgumentException("Contains(hashKey) is true"); }
 #endif
             Insert(key, value);
         }
 
-        public bool Contains(int keyX, int keyY) => FindEntry((keyX << 16) | keyY) >= 0;
-        public bool Contains(int key) => FindEntry(key) >= 0;
+        public bool Contains(int keyX, int keyY) { return FindEntry((keyX << 16) | keyY) >= 0; }
+        public bool Contains(int key) { return FindEntry(key) >= 0; }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public bool Remove(int keyX, int keyY) => Remove((keyX << 16) | keyY);
+        public bool Remove(int keyX, int keyY) { return Remove((keyX << 16) | keyY); }
         public bool Remove(int key)
         {
             int bucket = key & _modBitMask;
diff --git a/src/Internal/UnsafeArray.cs b/src/Internal/UnsafeArray.cs
index 3e0609b..4a1f796 100644
--- a/src/Internal/UnsafeArray.cs
+++ b/src/Internal/UnsafeArray.cs
@@ -55,10 +55,10 @@ namespace DCFApixels.DragonECS.Internal
             return CollectionUtility.AutoToString(EnumerableInt.Range(0, Length).Select(i => ptr[i]), "ua");
         }
 
-        IEnumerator<T> IEnumerable<T>.GetEnumerator() => GetEnumerator();
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        IEnumerator<T> IEnumerable<T>.GetEnumerator() { return GetEnumerator(); }
+        IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Enumerator GetEnumerator() => new Enumerator(ptr, Length);
+        public Enumerator GetEnumerator() { return new Enumerator(ptr, Length); }
         public struct Enumerator : IEnumerator<T>
         {
             private readonly T* _ptr;
@@ -74,15 +74,14 @@ namespace DCFApixels.DragonECS.Internal
             public T Current
             {
                 [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                get => _ptr[_index];
+                get { return _ptr[_index]; }
             }
-            object IEnumerator.Current => Current;
+            object IEnumerator.Current { get { return Current; } }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public bool MoveNext() => ++_index < _length;
+            public bool MoveNext() { return ++_index < _length; }
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Reset() { }
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Dispose() { }
+            void IDisposable.Dispose() { }
+            void IEnumerator.Reset() { throw new NotSupportedException(); }
         }
 
         internal class DebuggerProxy
diff --git a/src/Pools/EcsTagPool.cs b/src/Pools/EcsTagPool.cs
index ecfefe5..a0768e0 100644
--- a/src/Pools/EcsTagPool.cs
+++ b/src/Pools/EcsTagPool.cs
@@ -270,8 +270,8 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region IEnumerator - IntelliSense hack
-        IEnumerator<T> IEnumerable<T>.GetEnumerator() => throw new NotImplementedException();
-        IEnumerator IEnumerable.GetEnumerator() => throw new NotImplementedException();
+        IEnumerator<T> IEnumerable<T>.GetEnumerator() { throw new NotImplementedException(); }
+        IEnumerator IEnumerable.GetEnumerator() { throw new NotImplementedException(); }
         #endregion
 
         #region MarkersConverter