[streams] Fix exception in streams with 1 item that sometimes occurred

1 files changed, 15 insertions, 2 deletions

diff --git a/src/bun.js/builtins/js/ReadableStreamDefaultReader.js b/src/bun.js/builtins/js/ReadableStreamDefaultReader.js
index 9430a1037..4671f1458 100644
--- a/src/bun.js/builtins/js/ReadableStreamDefaultReader.js
+++ b/src/bun.js/builtins/js/ReadableStreamDefaultReader.js
@@ -96,12 +96,25 @@ function readMany()
     if (length > 0) {
         var outValues = @newArrayWithSize(length);
         if (@isReadableByteStreamController(controller)) {
-            for (var i = 0; i < length; i++) {
+
+            {
+                const buf = values[0];
+                if (!(@ArrayBuffer.@isView(buf) || buf instanceof @ArrayBuffer)) {
+                    @putByValDirect(outValues, 0, new @Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength));
+                } else {
+                    @putByValDirect(outValues, 0, buf);
+                }
+            }
+
+            for (var i = 1; i < length; i++) {
                 const buf = values[i];
                 if (!(@ArrayBuffer.@isView(buf) || buf instanceof @ArrayBuffer)) {
-                    @putByValDirect(outValues, i, @Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength));
+                    @putByValDirect(outValues, i, new @Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength));
+                } else {
+                    @putByValDirect(outValues, i, buf);
                 }
             }
+
         } else {
             @putByValDirect(outValues, 0, values[0].value);
             for (var i = 1; i < length; i++) {