Node.js read-only stream implementation

 This module allow one to use a readable/writable stream internally but to
 expose just the readable part of that internal stream.
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 A stream is an abstract interface for working with streaming data in Node.js.
 There are many stream objects provided by Node.js. For instance, a request to
 an HTTP server and process.stdout are both stream instances.
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 Node.js is an event-based server-side JavaScript engine.