Added a very complicated AsyncIterableReader class.

The class was already implemented in
"https://deno.land/std@0.144.0/streams/conversion.ts".  So, I litterally
lost 1 day of work!  I hate myself.

vendor/deno.land/std@0.188.0/crypto/timing_safe_equal.ts

@@ -0,0 +1,34 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// This module is browser compatible.
+
+import { assert } from "../_util/asserts.ts";
+
+/** Compare to array buffers or data views in a way that timing based attacks
+ * cannot gain information about the platform. */
+export function timingSafeEqual(
+  a: ArrayBufferView | ArrayBufferLike | DataView,
+  b: ArrayBufferView | ArrayBufferLike | DataView,
+): boolean {
+  if (a.byteLength !== b.byteLength) {
+    return false;
+  }
+  if (!(a instanceof DataView)) {
+    a = ArrayBuffer.isView(a)
+      ? new DataView(a.buffer, a.byteOffset, a.byteLength)
+      : new DataView(a);
+  }
+  if (!(b instanceof DataView)) {
+    b = ArrayBuffer.isView(b)
+      ? new DataView(b.buffer, b.byteOffset, b.byteLength)
+      : new DataView(b);
+  }
+  assert(a instanceof DataView);
+  assert(b instanceof DataView);
+  const length = a.byteLength;
+  let out = 0;
+  let i = -1;
+  while (++i < length) {
+    out |= a.getUint8(i) ^ b.getUint8(i);
+  }
+  return out === 0;
+}