refactor: use base array utility

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---

Author: kgryte

lib/node_modules/@stdlib/iter/unique/lib/main.js

@@ -23,41 +23,11 @@
 var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
 var isFunction = require( '@stdlib/assert/is-function' );
 var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
+var contains = require( '@stdlib/array/base/assert/contains' );
 var iteratorSymbol = require( '@stdlib/symbol/iterator' );
 var format = require( '@stdlib/string/format' );
 
 
-// FUNCTIONS //
-
-/**
-* Tests whether an array contains a provided value.
-*
-* @private
-* @param {Array} arr - input array
-* @param {*} v - test value
-* @returns {boolean} boolean indicating whether an array contains a provided value
-*
-* @example
-* var bool = contains( [ 1, 2, 3 ], 1 );
-* // returns true
-*
-* bool = contains( [ 1, 2, 3 ], 4 );
-* // returns false
-*/
-function contains( arr, v ) {
-	var len;
-	var i;
-
-	len = arr.length;
-	for ( i = 0; i < len; i++ ) {
-		if ( arr[ i ] === v ) {
-			return true;
-		}
-	}
-	return false;
-}
-
-
 // MAIN //
 
 /**