[racket] Performance help

From: Greg Hendershott (greghendershott at gmail.com)
Date: Fri Jan 2 15:12:44 EST 2015

> Would it help to use an eq? hash and turn all of the strings into
> symbols (hopefully up front)? That might make the hashing part faster
> in the best-known function.

Good idea. But unless I made a mistake, no, that's twice as slow, not
faster. All the string->symbol conversions seem to outweigh the faster
hash lookups.

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