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The JSON returned by Twitter’s API includes tweet IDs twice, once as a JSON number and once as a decimal string, to work around the fact that the numbers are not correctly parsed by JavaScript applications
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Martin Kleppmann (Designing Data-Intensive Applications: The Big Ideas Behind Reliable, Scalable, and Maintainable Systems)
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Instead of passing our callback function directly to getJSON(), we instead pass it to the then() method. When the HTTP response arrives, the body of that response is parsed as JSON, and the resulting parsed value is passed to the function that we passed to then().
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David Flanagan (JavaScript: The Definitive Guide: Master the World's Most-Used Programming Language)