buffer: remove unused param from copyActual

Author: gurgunday

lib/buffer.js

@@ -268,7 +268,7 @@ function copyImpl(source, target, targetStart, sourceStart, sourceEnd) {
   return _copyActual(source, target, targetStart, sourceStart, sourceEnd);
 }
 
-function _copyActual(source, target, targetStart, sourceStart, sourceEnd, isUint8Copy = false) {
+function _copyActual(source, target, targetStart, sourceStart, sourceEnd) {
   if (sourceEnd - sourceStart > target.byteLength - targetStart)
     sourceEnd = sourceStart + target.byteLength - targetStart;
 
@@ -280,7 +280,7 @@ function _copyActual(source, target, targetStart, sourceStart, sourceEnd, isUint
   if (nb <= 0)
     return 0;
 
-  if (sourceStart === 0 && nb === sourceLen && (isUint8Copy || isUint8Array(target))) {
+  if (sourceStart === 0 && nb === sourceLen && isUint8Array(target)) {
     TypedArrayPrototypeSet(target, source, targetStart);
   } else {
     _copy(source, target, targetStart, sourceStart, nb);