Increase lookup speed and decrease binary size #13
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This patch changes the is_xid_start and is_xid_continue checks to use a list of bits instead of a binary search for some lower part of the unicode range. The code generating script chooses the cutoff for switching strategies to minimize binary size. For my benchmark on my machine, it reduces the runtime from 2.2 seconds to 1.3 seconds and decreases the binary size (release mode) by 4096 bytes. (I would like to get a more precise look at the effect on size, but cargo-bloat is not helping me for some reason.)
I used the following benchmark for this: