--- /dev/null
+'use strict';
+
+var eq = require('./eq')
+ , value = require('./valid-value')
+
+ , keys = Object.keys
+ , propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
+
+module.exports = function (a, b) {
+ var k1, k2;
+
+ if (eq(value(a), value(b))) return true;
+
+ a = Object(a);
+ b = Object(b);
+
+ k1 = keys(a);
+ k2 = keys(b);
+ if (k1.length !== k2.length) return false;
+ return k1.every(function (key) {
+ if (!propertyIsEnumerable.call(b, key)) return false;
+ return eq(a[key], b[key]);
+ });
+};