Core: Don't rely on splice being present on input

Without this fix calling `jQuery.uniqueSort` on an array-like can result in:

TypeError: results.splice is not a function
    at Function.jQuery.uniqueSort (https://code.jquery.com/jquery-git.js:664:12)
    at jQuery.fn.init.find (https://code.jquery.com/jquery-git.js:2394:27)
    at gocusihafe.js:3:4

Closes gh-4986

1 files changed, 2 insertions, 1 deletions

diff --git a/src/selector/uniqueSort.js b/src/selector/uniqueSort.js
index 127cc7068..e9438485c 100644
--- a/src/selector/uniqueSort.js
+++ b/src/selector/uniqueSort.js
@@ -1,6 +1,7 @@
 import jQuery from "../core.js";
 import document from "../var/document.js";
 import sort from "../var/sort.js";
+import splice from "../var/splice.js";
 
 var hasDuplicate;
 
@@ -80,7 +81,7 @@ jQuery.uniqueSort = function( results ) {
 			}
 		}
 		while ( j-- ) {
-			results.splice( duplicates[ j ], 1 );
+			splice.call( results, duplicates[ j ], 1 );
 		}
 	}