remove some warnings

Author: mpartipilo

src/Weaviate.Client/Models/OneOrManyOf.cs

@@ -1,29 +1,24 @@
 using System.Collections;
+using System.Diagnostics.CodeAnalysis;
 
 namespace Weaviate.Client.Models;
 
-public class OneOrManyOf<T> : IEnumerable<T>
+public class OneOrManyOf<T>(IEnumerable<T> items) : IEnumerable<T>
 {
-    private readonly List<T> _items;
+    private readonly List<T> _items = [.. items];
 
-    public OneOrManyOf(IEnumerable<T> items)
-    {
-        _items = new(items);
-    }
-
-    public OneOrManyOf(params T[] item)
-    {
-        _items = new(item);
-    }
+    public OneOrManyOf(params T[] items)
+        : this(items.AsEnumerable()) { }
 
-    public static implicit operator OneOrManyOf<T>(T item) => new OneOrManyOf<T>(item);
+    public static implicit operator OneOrManyOf<T>(T item) => new(item);
 
+    [return: NotNullIfNotNull(nameof(items))]
     public static implicit operator OneOrManyOf<T>?(T[]? items) =>
-        items is null ? null : new OneOrManyOf<T>(items);
+        items is null ? null : new(items);
 
-    public static implicit operator OneOrManyOf<T>(List<T> items) => new OneOrManyOf<T>(items);
+    public static implicit operator OneOrManyOf<T>(List<T> items) => items;
 
-    public static explicit operator T[](OneOrManyOf<T> list) => list._items.ToArray();
+    public static explicit operator T[](OneOrManyOf<T> list) => [.. list._items];
 
     public IEnumerator<T> GetEnumerator() => _items.GetEnumerator();