buffer: let Buffer.of use heap

PR-URL: #60503
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: ChALkeR

lib/buffer.js

@@ -386,8 +386,9 @@ Buffer.copyBytesFrom = function copyBytesFrom(view, offset, length) {
 // Refs: https://tc39.github.io/ecma262/#sec-%typedarray%.of
 // Refs: https://esdiscuss.org/topic/isconstructor#content-11
 const of = (...items) => {
-  const newObj = createUnsafeBuffer(items.length);
-  for (let k = 0; k < items.length; k++)
+  const len = items.length;
+  const newObj = new FastBuffer(len); // In heap for small sizes
+  for (let k = 0; k < len; k++)
     newObj[k] = items[k];
   return newObj;
 };