ECMAScript6 WeakMap polyfill


WeakMap collection as specified in ECMAScript6. Roughly inspired by Mark Miller's and Kris Kowal's WeakMap implementation.

Differences are:
 - Assumes compliant ES5 environment (no weird ES3 workarounds or hacks)
 - Well modularized CJS style
 - Based on one solution.

 - Will fail on non extensible objects provided as keys

Node.js is an event-based server-side JavaScript engine.

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