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This comes from #5153. In CGAL-5.2, with GMP, the default rational type was mpq_rational on linux and Gmpq on windows. #5153 has the side effect of making it mpq_rational on both. We need to decide if that is the right choice (I think so, even if it slows down some packages a bit), and announce the result in changes.md. That PR had the sugested wording
On windows, the type used for Exact_rational, in Epick and indirectly (through Lazy_exact_nt) Epeck may now be boost::multiprecision::mpq_rational, as has been the case on other platforms for several releases. This depends on various options and is added to a list that includes mpq_class, CGAL::Gmpq, leda_rational and
CGAL::Quotient<CGAL::MP_Float>.