Revised use of copy to avoid errors with buffer lengths.

Author: electricessence

source/Extensions.Subsets.cs

@@ -90,9 +90,7 @@ public static IEnumerable<T[]> Subsets<T>(this IReadOnlyList<T> source, int coun
 		{
 			foreach (var s in SubsetsBuffered(source, count))
 			{
-				var a = new T[count];
-				s.CopyTo(a, 0);
-				yield return a;
+				yield return s.AsCopy(count);
 			}
 		}
 

source/Extensions.cs

@@ -118,14 +118,15 @@ public static void ForEach<T>(this T[,] source, Action<int, int, T> closure)
 			}
 		}
 
-		public static T[] AsCopy<T>(this T[] source)
+		public static T[] AsCopy<T>(this T[] source, int? length = null)
 		{
 			if (source is null)
 				throw new NullReferenceException();
 			Contract.EndContractBlock();
 
-			var newArray = new T[source.Length];
-			for (var i = 0; i < source.Length; i++)
+			var newArray = new T[length ?? source.Length];
+			var len = Math.Min(newArray.Length, source.Length);
+			for (var i = 0; i < len; i++)
 				newArray[i] = source[i];
 			return newArray;
 		}

source/Open.Collections.csproj

@@ -16,7 +16,7 @@
 		<PackageProjectUrl>https://github.com/Open-NET-Libraries/Open.Collections/</PackageProjectUrl>
 		<RepositoryUrl>https://github.com/Open-NET-Libraries/Open.Collections/</RepositoryUrl>
 		<RepositoryType>git</RepositoryType>
-		<Version>2.9.0</Version>
+		<Version>2.9.1</Version>
 		<PackageReleaseNotes></PackageReleaseNotes>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>
 		<PublishRepositoryUrl>true</PublishRepositoryUrl>