Remove the need for the internal setArray method, it was only really used by...

Remove the need for the internal setArray method, it was only really used by pushStack anyway. Fixes #6003.

src/core.js

@@ -197,7 +197,14 @@ jQuery.fn = jQuery.prototype = {
 	// (returning the new matched element set)
 	pushStack: function( elems, name, selector ) {
 		// Build a new jQuery matched element set
-		var ret = jQuery( elems || null );
+		var ret = jQuery();
+
+		if ( jQuery.isArray( elems ) ) {
+			push.apply( ret, elems );
+		
+		} else {
+			jQuery.merge( ret, elems );
+		}
 
 		// Add the old object onto the stack (as a reference)
 		ret.prevObject = this;
@@ -214,18 +221,6 @@ jQuery.fn = jQuery.prototype = {
 		return ret;
 	},
 
-	// Force the current matched set of elements to become
-	// the specified array of elements (destroying the stack in the process)
-	// You should use pushStack() in order to do this, but maintain the stack
-	setArray: function( elems ) {
-		// Resetting the length to 0, then using the native Array push
-		// is a super-fast way to populate an object with array-like properties
-		this.length = 0;
-		push.apply( this, elems );
-
-		return this;
-	},
-
 	// Execute a callback for every element in the matched set.
 	// (You can seed the arguments with an array of args, but this is
 	// only used internally.)