[racket] JSON module: why symbols for object keys? lists for arrays?

If you have a really performance-sensitive use of JSON, you might want 
to try "http://www.neilvandyke.org/racket-json-parsing/".

Using this package, you can either parse to your own JSON representation 
(say, alists instead of hashes, non-interned strings for object member 
names, vectors for arrays), or simply operate on the JSON during parsing 
without building an intermediate representation.

Neil V.