fixup! Add checked transform variant of convert()

Author: juntuu

jsrc/conversions.cpp

@@ -312,7 +312,7 @@ convert<Q, D>(J jt, array w, void *yv) -> bool {
     auto const add_digits = [&](auto n, auto v) {
         auto f = 1.0;
         auto d = 0.0;
-        std::for_each_n(v, n, [&](auto i) {
+        std::for_each(v, v + n, [&](auto i) {
             d += f * i;
             f *= xb;
         });