--- sv.c        2020-09-29 22:29:16.781395700 +1000
+++ sv.c_mod    2020-10-02 11:35:20.728840400 +1000
@@ -13115,7 +13115,7 @@
                 && intsize != 'q'
             ) {
                 WITH_LC_NUMERIC_SET_TO_NEEDED_IN(in_lc_numeric,
-                    SNPRINTF_G(fv, ebuf, sizeof(ebuf), precis)
+                    PERL_UNUSED_RESULT(sprintf(ebuf, "%.*g", (int)precis, (NV) fv))
                 );
                 elen = strlen(ebuf);
                 eptr = ebuf;