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mpq_t * GMP_PTR mpz_t * GMP_PTR ... INPUT GMP_PTR $var = INT2PTR($type, SvIVX(SvRV($arg)))
mpq_t * T_PTRREF mpz_t * T_PTRREF mpf_t * T_PTRREF mpfr_t * T_PTRREF gmp_randstate_t * T_PTRREF