allocUnsafe for faster buffer cloning

It's safe to do this because we immediately overwrite the entire buffer. No need to zero out first.

src/bufferutils.js

@@ -42,7 +42,7 @@ function reverseBuffer(buffer) {
 }
 exports.reverseBuffer = reverseBuffer;
 function cloneBuffer(buffer) {
-  const clone = Buffer.alloc(buffer.length);
+  const clone = Buffer.allocUnsafe(buffer.length);
   buffer.copy(clone);
   return clone;
 }

ts_src/bufferutils.ts

@@ -49,7 +49,7 @@ export function reverseBuffer(buffer: Buffer): Buffer {
 }
 
 export function cloneBuffer(buffer: Buffer): Buffer {
-  const clone = Buffer.alloc(buffer.length);
+  const clone = Buffer.allocUnsafe(buffer.length);
   buffer.copy(clone);
   return clone;
 }