Adding support for boxed primitives

index.js

@@ -27,6 +27,9 @@ if (!getPrototypeOf) {
 	}
 }
 
+var boolType = '[object Boolean]';
+var numberType = '[object Number]';
+var stringType = '[object String]';
 var dateType = '[object Date]';
 var regexType = '[object RegExp]';
 var arrayType = '[object Array]';
@@ -39,6 +42,14 @@ module.exports = function isEqual(value, other) {
 	var type = toString.call(value);
 	if (type !== toString.call(other)) { return false; }
 
+	if (type === boolType) { return value.valueOf() === other.valueOf(); }
+
+	if (type === numberType) {
+		return (Number(value) === Number(other)) || (isNaN(value) && isNaN(other));
+	}
+
+	if (type === stringType) { return String(value) === String(other); }
+
 	if (type === dateType) { return value.getTime() === other.getTime(); }
 
 	if (type === regexType) { return String(value) === String(other); }

test.js

@@ -11,6 +11,21 @@ test('primitives', function (t) {
 	t.ok(isEqual('foo', 'foo'), 'strings are equal');
 	t.ok(isEqual(42, 42), 'numbers are equal');
 	t.ok(isEqual(0 / Infinity, -0 / Infinity), 'opposite sign zeroes are equal');
+	t.ok(isEqual(Infinity, Infinity), 'infinities are equal');
+	t.end();
+});
+
+test('NaN', function (t) {
+	t.ok(isEqual(NaN, NaN), 'NaNs are equal');
+	t.end();
+});
+
+test('boxed primitives', function (t) {
+	t.ok(isEqual(new String(''), ''), 'Empty String and empty string are equal');
+	t.ok(isEqual(new String('foo'), 'foo'), 'String and string are equal');
+	t.ok(isEqual(new Boolean(true), true), 'Boolean true and boolean true are equal');
+	t.ok(isEqual(new Boolean(false), false), 'Boolean false and boolean false are equal');
+	t.ok(isEqual(new Number(42), 42), 'Number and number literal are equal');
 	t.end();
 });