fixup

Author: ronag

lib/buffer.js

@@ -30,8 +30,8 @@ const {
   MathFloor,
   MathMin,
   MathTrunc,
-  NumberIsNaN,
   NumberIsInteger,
+  NumberIsNaN,
   NumberMAX_SAFE_INTEGER,
   NumberMIN_SAFE_INTEGER,
   ObjectDefineProperties,
@@ -235,9 +235,6 @@ function _copy(source, target, targetStart, sourceStart, sourceEnd) {
       throw new ERR_OUT_OF_RANGE('sourceEnd', '>= 0', sourceEnd);
   }
 
-  if (targetStart >= target.length || sourceStart >= sourceEnd)
-    return 0;
-
   return _copyActual(source, target, targetStart, sourceStart, sourceEnd);
 }
 
@@ -250,6 +247,9 @@ function _copyActual(source, target, targetStart, sourceStart, sourceEnd) {
   if (nb > sourceLen)
     nb = sourceLen;
 
+  if (nb === 0)
+    return 0;
+
   if (sourceStart !== 0 || sourceEnd < source.length) {
     copyArrayBuffer(
       target.buffer,