boolean can be detected with typeof

according to mdn `typeof` return string boolean for the boolean type (`true` and `false)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof

index.js

@@ -11,15 +11,15 @@ const is = value => {
 		return 'null';
 	}
 
-	if (value === true || value === false) {
-		return 'boolean';
-	}
-
 	const type = typeof value;
 
 	if (type === 'undefined') {
 		return 'undefined';
 	}
+	
+	if (value === 'boolean') {
+		return 'boolean';
+	}
 
 	if (type === 'string') {
 		return 'string';