optimize first operator in frozen-sequence by removing unnecessary readonly reference

Author: fembina

Sources/Falko.Common.Sequences/Sequences/FrozenSequence.Operator.First.cs

@@ -20,7 +20,7 @@ public T First(Func<T, bool> predicate)
     {
         ArgumentNullException.ThrowIfNull(predicate);
 
-        foreach (ref readonly var item in this)
+        foreach (var item in this)
         {
             if (predicate(item)) return item;
         }

Sources/Falko.Common.Sequences/Sequences/FrozenSequence.cs

@@ -50,7 +50,6 @@ public T this[int index]
     /// Use the <see cref="AsEnumerable"/> method to iterate in asynchronous code.
     /// </remarks>
     /// <returns>An enumerator that can be used to iterate through the sequence.</returns>
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public ValueEnumerator GetEnumerator() => new(_items, _itemsCount);
 
     IEnumerator<T> IEnumerable<T>.GetEnumerator() => new Enumerator(_items, _itemsCount);