fix: large streaming uploads could fail with an invalid SHA-256 hash error

integration.ts

@@ -99,8 +99,7 @@ Deno.test({
     // First generate a 32MiB file in memory, 1 MiB at a time, as a stream
     const dataStream = readableStreamFromIterable(async function* () {
       for (let i = 0; i < 32; i++) {
-        await new Promise((r) => setTimeout(r, 10)); // Wait 10ms
-        yield new Uint8Array(1024 * 1024).fill(0b01010101); // Yield 1MB of data (alternating ones and zeroes)
+        yield new Uint8Array(1024 * 1024).fill(i % 256); // Yield 1MB of data
       }
     }());
 
@@ -110,7 +109,7 @@ Deno.test({
     const response = await client.putObject(key, dataStream, { partSize: 5 * 1024 * 1024, metadata });
     // The etag is generated by the server, based on the contents. Also, etags for multi-part uploads are
     // different than for regular uploads, so the "-7" confirms it worked and used a multi-part upload.
-    assertEquals(response.etag, "4581589392ae60eafdb031f441858c7a-7");
+    assertEquals(response.etag, "ca6d977b6e7dc87ab5c5892e124c7277-7");
     // Validate that the metadata was set:
     const stat = await client.statObject(key);
     assertEquals(stat.metadata, metadata);

transform-chunk-sizes.ts

@@ -10,15 +10,13 @@ export class TransformChunkSizes extends TransformStream<Uint8Array, Uint8Array>
     const buffer = new Buffer();
     buffer.grow(outChunkSize);
 
-    // This is a chunk-sized buffer that gets re-used each time we pass a new chunk out of this transform stream.
-    const outChunk = new Uint8Array(outChunkSize);
-
     super({
       start() {}, // required
       async transform(chunk, controller) {
         buffer.write(chunk);
 
         while (buffer.length >= outChunkSize) {
+          const outChunk = new Uint8Array(outChunkSize);
           const readFromBuffer = await buffer.read(outChunk);
           if (readFromBuffer !== outChunkSize) {
             throw new Error(