No rounding needed if 'ndigits` is bigger than `DBL_DIG+2`; fix #4566

277be410 · Yukihiro "Matz" Matsumoto · 6f67fddb · 277be410
Commit 277be410 authored Jul 20, 2019 by Yukihiro "Matz" Matsumoto
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src/numeric.c src/numeric.c +1 -0

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--- a/src/numeric.c
+++ b/src/numeric.c
@@ -702,6 +702,7 @@ flo_round(mrb_state *mrb, mrb_value num)

  f = 1.0;
  i = ndigits >= 0 ? ndigits : -ndigits;
+  if (ndigits > DBL_DIG+2) return num;
  while  (--i >= 0)
    f = f*10.0;