I see. I don't do it on purpose... I looked at some singular source files, but I don't know if I have the most recent. But it looks like they are trying to look inside ntl's ZZ representation. That's a big no no. Right now, the only semi efficient way to do this with the existing interface is to use ZZToBytes (or something like that). I could add some special routines for direct gmp bignum conversions, if there was a demand for that.
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