[Fix] Boxed Symbols should be coerced to primitives before testing fo…

…r equality.

index.js

@@ -11,8 +11,11 @@ var isGenerator = require('is-generator-function');
 var isNumber = require('is-number-object');
 var isRegex = require('is-regex');
 var isString = require('is-string');
+var isSymbol = require('is-symbol');
 var isCallable = require('is-callable');
 
+var symbolValue = typeof Symbol === 'function' ? Symbol.prototype.valueOf : null;
+
 var getPrototypeOf = Object.getPrototypeOf;
 if (!getPrototypeOf) {
 	/* eslint-disable no-proto */
@@ -92,6 +95,13 @@ module.exports = function isEqual(value, other) {
 		return index <= 0;
 	}
 
+	var valueIsSym = isSymbol(value);
+	var otherIsSym = isSymbol(other);
+	if (valueIsSym !== otherIsSym) { return false; }
+	if (valueIsSym && otherIsSym) {
+		return symbolValue.call(value) === symbolValue.call(other);
+	}
+
 	var valueIsGen = isGenerator(value);
 	var otherIsGen = isGenerator(other);
 	if (valueIsGen !== otherIsGen) { return false; }

package.json

@@ -37,7 +37,8 @@
 		"is-generator-function": "^1.0.3",
 		"is-number-object": "^1.0.3",
 		"is-regex": "^1.0.3",
-		"is-string": "^1.0.4"
+		"is-string": "^1.0.4",
+		"is-symbol": "^1.0.1"
 	},
 	"devDependencies": {
 		"tape": "^4.2.0",

test.js

@@ -191,8 +191,11 @@ var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbo
 test('symbols', { skip: !hasSymbols }, function (t) {
 	var foo = 'foo';
 	var fooSym = Symbol(foo);
+	var objectFooSym = Object(fooSym);
 	t.ok(isEqual(fooSym, fooSym), 'Symbol("foo") is equal to itself');
+	t.ok(isEqual(fooSym, objectFooSym), 'Symbol("foo") is equal to the object form of itself');
 	t.notOk(isEqual(Symbol(foo), Symbol(foo)), 'Symbol("foo") is not equal to Symbol("foo"), even when the string is the same instance');
+	t.notOk(isEqual(Symbol(foo), Object(Symbol(foo))), 'Symbol("foo") is not equal to Object(Symbol("foo")), even when the string is the same instance');
 
 	t.end();
 });