Revert "perf: improve Buffer.from(buf) by 29x" (#24351)

https://github.com/denoland/deno/pull/24341#discussion_r1655247367

Reverts denoland/deno#24341

1 files changed, 0 insertions, 11 deletions

diff --git a/ext/node/polyfills/internal/buffer.mjs b/ext/node/polyfills/internal/buffer.mjs
index de3568a83..a051965a3 100644
--- a/ext/node/polyfills/internal/buffer.mjs
+++ b/ext/node/polyfills/internal/buffer.mjs
@@ -229,22 +229,11 @@ function fromArrayLike(array) {
   return buf;
 }
 
-function fromUint8Array(u8) {
-  const buf = new Uint8Array(u8.buffer, u8.byteOffset, u8.byteLength);
-  Object.setPrototypeOf(buf, Buffer.prototype);
-  return buf.slice();
-}
-
 function fromObject(obj) {
   if (obj.length !== undefined || isAnyArrayBuffer(obj.buffer)) {
     if (typeof obj.length !== "number") {
       return createBuffer(0);
     }
-
-    if (obj instanceof Uint8Array) {
-      return fromUint8Array(obj);
-    }
-
     return fromArrayLike(obj);
   }