Add string formatting support for longlong and mpz.
diff --git a/py/mpz.h b/py/mpz.h
index cbe60eb..04b06b8 100644
--- a/py/mpz.h
+++ b/py/mpz.h
@@ -76,5 +76,6 @@
mp_float_t mpz_as_float(const mpz_t *z);
#endif
uint mpz_as_str_size(const mpz_t *z, uint base);
+uint mpz_as_str_size_formatted(const mpz_t *i, uint base, const char *prefix, char comma);
char *mpz_as_str(const mpz_t *z, uint base);
-uint mpz_as_str_inpl(const mpz_t *z, uint base, char *str);
+uint mpz_as_str_inpl(const mpz_t *z, uint base, const char *prefix, char base_char, char comma, char *str);