make chunked return sequence of sequences

src/sync/impl.ts

@@ -612,7 +612,7 @@ export abstract class BaseSequence<TElement> extends SequenceMarker implements S
     return new ReversedSequence<TElement>(this);
   }
 
-  chunked(size: number): Sequence<TElement[]> {
+  chunked(size: number): Sequence<Sequence<TElement>> {
     if (size <= 0) {
       throw new Error("Chunk size must be positive.");
     }
@@ -2245,7 +2245,7 @@ class GroupBySequence<TElement, TKey, TResult> extends BaseSequence<GroupedSeque
   }
 }
 
-class ChunkedSequence<T> extends BaseSequence<T[]> {
+class ChunkedSequence<T> extends BaseSequence<Sequence<T>> {
   readonly #sequence: Sequence<T>;
   readonly #size: number;
 
@@ -2272,13 +2272,13 @@ class ChunkedSequence<T> extends BaseSequence<T[]> {
       chunk.push(obj);
 
       if (chunk.length === this.#size) {
-        yield chunk;
+        yield array(chunk);
         chunk = [];
       }
     }
 
     if (chunk.length > 0) {
-      yield chunk;
+      yield array(chunk);
     }
   }
 }