Parsing Keywords in Lisp with Speed of C

I am learning Common Lisp, so I am experimenting and playing around with things. It started with writing a small command-line parsing library, and ended with a trip into a rabbit hole of an experiment. I do not know if someone will find it useful, perhaps not, but it is nice to write things down, it sorts of clean thoughts, at least for me.

Typically, for parsing program options, we use something like getopt & co in C/C++, or some similar offering. But if you have lots of options and want faster parsing, you will probably use gperf. Gperf is a code generator which can construct perfect hash from a given set of keywords, i.e. our program options. For this experiment, I used keywords of the C language, rather than some imaginary options.