Blazing fast unique hash generator

 This module has the following features:
  - no dependencies
  - minimal footprint
  - works in all of node.js, io.js, and the browser
  - hashes functions based on their source code
  - produces different hashes for different object types
  - support for circular references in objects
  - ignores property assignment order
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 Node.js is an event-based server-side JavaScript engine.