tweak new code, update release notes

docs/release-notes.md

@@ -6,6 +6,7 @@ See [release highlights](https://www.patreon.com/posts/66986798).
 
 * For players:
   * Optimized mod image file loading.
+  * Minor optimizations (thanks to Michael Kuklinski / Ameisen!).
 * For mod authors:
   * Added a new `IRawTextureData` asset type.  
     _You can now load image files through `helper.ModContent` as `IRawTextureData` instead of `Texture2D`. This provides the image size and raw pixel data, which you can pass into other SMAPI APIs like `asset.AsImage().PatchImage`. This is much more efficient when you don't need a full `Texture2D` instance, since it bypasses the GPU operations needed to create one._

src/SMAPI/Framework/Content/ContentCache.cs

@@ -106,23 +106,19 @@ namespace StardewModdingAPI.Framework.Content
         /// <returns>Returns any removed keys.</returns>
         public IEnumerable<string> Remove(Func<string, object, bool> predicate, bool dispose)
         {
-            List<string> removed = new List<string>();
+            List<string> removed = new();
             foreach ((string key, object value) in this.Cache)
             {
                 if (predicate(key, value))
-                {
                     removed.Add(key);
-                }
             }
 
             foreach (string key in removed)
-            {
                 this.Remove(key, dispose);
-            }
 
-            // If `removed` is empty, return an empty `Enumerable` instead so that `removed`
-            // can be quickly collected in Gen0 instead of potentially living longer.
-            return removed.Count == 0 ? Enumerable.Empty<string>() : removed;
+            return removed.Count == 0
+                ? Enumerable.Empty<string>() // let GC collect the list in gen0 instead of potentially living longer
+                : removed;
         }
     }
 }