node-deep-is

node's assert.deepEqual algorithm except for NaN being equal to NaN
  https://github.com/thlorenz/deep-is
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Node's `assert.deepEqual() algorithm` as a standalone module. Exactly like deep-equal except for the fact that `deepEqual(NaN, NaN) === true`.

This module is around 5 times faster than wrapping `assert.deepEqual()` in a `try/catch`.

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