🐛 fix: middle() for -ve indices

Author: wolfram77

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "extra-array",
-  "version": "4.1.11",
+  "version": "4.1.12",
   "description": "An array is a collection of values, stored contiguously.",
   "main": "index.js",
   "module": "index.mjs",

package.json

@@ -1356,6 +1356,8 @@ export {last as back};
  * @returns x[i..i+n]
  */
 export function middle<T>(x: T[], i: number, n: number=1): T[] {
+  var i = index(x, i);
+  var n = Math.max(n, 0);
   return x.slice(i, i+n);
 }