[Fix] do not use Object.prototype.toString when Symbol.toStringTag is shammed

Author: ljharb

index.js

@@ -13,7 +13,7 @@ var tryBooleanObject = function booleanBrandCheck(value) {
 	}
 };
 var boolClass = '[object Boolean]';
-var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+var hasToStringTag = typeof Symbol === 'function' && !!Symbol.toStringTag;
 
 module.exports = function isBoolean(value) {
 	if (typeof value === 'boolean') {

test/index.js

@@ -2,7 +2,7 @@
 
 var test = require('tape');
 var isBoolean = require('../');
-var hasSymbols = typeof Symbol === 'function' && typeof Symbol('') === 'symbol';
+var hasSymbols = require('has-symbols/shams')();
 
 test('not Booleans', function (t) {
 	t.test('primitives', function (st) {