buffer: alias subarray and slice

PR-URL: #41596
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

lib/buffer.js

@@ -1113,14 +1113,18 @@ function adjustOffset(offset, length) {
   return NumberIsNaN(offset) ? 0 : length;
 }
 
-Buffer.prototype.slice = function slice(start, end) {
+Buffer.prototype.subarray = function subarray(start, end) {
   const srcLength = this.length;
   start = adjustOffset(start, srcLength);
   end = end !== undefined ? adjustOffset(end, srcLength) : srcLength;
   const newLength = end > start ? end - start : 0;
   return new FastBuffer(this.buffer, this.byteOffset + start, newLength);
 };
 
+Buffer.prototype.slice = function slice(start, end) {
+  return this.subarray(start, end);
+};
+
 function swap(b, n, m) {
   const i = b[n];
   b[n] = b[m];