Running integrate on a small polytope as explained at https://ask.sagemath.org/question/64141/ and illustrated [at Sagecell](https://sagecell.sagemath.org/?z=eJxNjsEKgzAQRO-C_7DHBNIQe_cfPJReREowqw2osZvtoX_fxFLiYZeZN8syE4UVop1R-42RJjti1ItlRvDrHogh85ksY1110EIXls8THYVNeHzFtu-NgkZB2mZQ0Cd5OVlzyKa4f17CDEtocn569JsMsroeN80wyLraKVUTpZ-ATo_OPe6EO2HEjS37VFMqSLi90RtBgvwCbbxCDQ==&lang=sage&interacts=eJyLjgUAARUAuQ==) results in the error: integrate: latte_gmp.cpp:76: NTL::ZZ convert_mpq_to_ZZ(__mpq_struct*): Assertion `elt.get_den() == 1' failed.