refactor

src/bitarray/impl.ts

@@ -1,5 +1,6 @@
 import { join } from "../collector/index.js";
 import { arrayLike, sequence } from "../sync/index.js";
+import { emptyIterableIterator } from "../utils.js";
 import { BitArray } from "./types.js";
 
 const BYTE_SIZE = Uint8Array.BYTES_PER_ELEMENT * 8;
@@ -234,9 +235,7 @@ export class BitArrayImpl implements BitArray {
 
 export class EmptyBitArray implements BitArray {
   [Symbol.iterator](): Iterator<boolean, any, undefined> {
-    return {
-      next: () => ({ done: true, value: undefined })
-    };
+    return emptyIterableIterator<boolean>();
   }
 
   get length() {