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diff --git a/addon-sdk/source/lib/sdk/lang/functional.js b/addon-sdk/source/lib/sdk/lang/functional.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Disclaimer: Some of the functions in this module implement APIs from
+// Jeremy Ashkenas's http://underscorejs.org/ library and all credits for
+// those goes to him.
+
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { defer, remit, delay, debounce,
+        throttle } = require("./functional/concurrent");
+const { method, invoke, partial, curry, compose, wrap, identity, memoize, once,
+        cache, complement, constant, when, apply, flip, field, query,
+        isInstance, chainable, is, isnt } = require("./functional/core");
+
+exports.defer = defer;
+exports.remit = remit;
+exports.delay = delay;
+exports.debounce = debounce;
+exports.throttle = throttle;
+
+exports.method = method;
+exports.invoke = invoke;
+exports.partial = partial;
+exports.curry = curry;
+exports.compose = compose;
+exports.wrap = wrap;
+exports.identity = identity;
+exports.memoize = memoize;
+exports.once = once;
+exports.cache = cache;
+exports.complement = complement;
+exports.constant = constant;
+exports.when = when;
+exports.apply = apply;
+exports.flip = flip;
+exports.field = field;
+exports.query = query;
+exports.isInstance = isInstance;
+exports.chainable = chainable;
+exports.is = is;
+exports.isnt = isnt;