`"0x10".to_f` should be `0`, not `16.0`; fix
@@ -2505,6 +2505,7 @@ mrb_str_len_to_dbl(mrb_state *mrb, const char *s, size_t len, mrb_bool badcheck)
if (pend - p > 2 && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
mrb_value x;
+ if (!badcheck) return 0.0;
x = mrb_str_len_to_inum(mrb, p, pend-p, 0, badcheck);
if (mrb_fixnum_p(x))
d = (double)mrb_fixnum(x);
