fmt_fp.c: exponential may be bigger than `100`.
MODIFY
src/fmt_fp.c
src/fmt_fp.c
@@ -356,6 +356,10 @@ mrb_format_float(mrb_float f, char *buf, size_t buf_size, char fmt, int prec, ch
if (e_sign) {
*s++ = e_char;
*s++ = e_sign;
+ if (e >= 100) {
+ *s++ = '0' + (e / 100);
+ e %= 100;
+ }
*s++ = '0' + (e / 10);
*s++ = '0' + (e % 10);
}

fmt_fp.c: exponential may be bigger than `100`.