Is setting the pretokenise flag advisable?

With pretokenise, Espruino still ends up having to do some evaluation, but effectively what happens is all whitespace gets removed and all the keywords get squashed down into a single byte. So you're getting a speedup because it's not having to parse all the keywords, but you're also getting better memory usage - think of it as super-minification.

The code's pretokenised at upload time, so you're going to see speed improvements for all execution, even long running stuff.

Gotchas? Readability when using dump() on in stack traces since all whitespace is removed, and I just don't think it's had quite the same level of testing. If you hit some problem with it that you can narrow down to a small piece of code then I'm happy to try and fix though.