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Conditional compilation can be quite certainly used. The best way to find out the space requirements is to try out some of the examples provided. I cannot give the overhead exactly, but it can be read from the source with not too much effort. Send an email to tanel.tammet at gmail.com if you need help with that. In broad terms, we have been very careful with using memory, both for the reasons you state and the reason of getting more bang from the cache.

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