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InfluxDB
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For a list of all the functions implemented by the runtime, you can look at the files in this directory: https://github.com/racket/racket/tree/master/racket/src/cs/primitive
I found Make a Lisp to be a lot of fun, or if you want your head exploded there's The Most Beautiful Program Ever Written (very much worth a watch even if you don't want your head exploded).
Here's a paper describing the macro system: https://www.cs.utah.edu/plt/scope-sets/ and here's a collection of expanders using that approach, from simple to large: https://github.com/mflatt/expander