recommend using native Set for less strict case

README.md

@@ -33,7 +33,7 @@ arrayHasDuplicates([3, 3, 3]); //=> true
 arrayHasDuplicates([3, '3', [3]]); //=> false
 ```
 
-*"Duplicated"* means a value is identical to with another value in the ECMAScript [same-value equality](https://developer.mozilla.org/docs/Web/JavaScript/Equality_comparisons_and_sameness#Same-value_equality) level.
+*"Duplicated"* means a value is identical to another value in the ECMAScript [same-value equality](https://developer.mozilla.org/docs/Web/JavaScript/Equality_comparisons_and_sameness#Same-value_equality) level.
 
 ```javascript
 arrayHasDuplicates([0, -0]); //=> false
@@ -46,6 +46,16 @@ arrayHasDuplicates([, undefined]);
 //=> false, though array[0] and array[1] are both `undefined`
 ```
 
+### Tips
+
+When the difference between `-0` and `+0` is not important, there is no need to use this module and the [`Set`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) constructor serves the purpose.
+
+```javascript
+function arrayHasDuplicatesLoose(arr) {
+  return arr.length !== new Set(arr).size;
+}
+```
+
 ## License
 
 [ISC License](./LICENSE) © 2018 Shinnosuke Watanabe